A Synopsis Of The Physical Anthropology Of The Corded Ware Complex

[Waarnemer]

A Synopsis Of The Physical Anthropology Of The Corded Ware Complex On The Background Of The Expansion Of The Kurgan Cultures

--- Journal of Indo-European Studies vol. 8 (1980) 361ff ---

ROLAND MENK
University of Geneva, Switzerland

Morphometrical data of human skeletal material from Eastern and Central Europe, of the period 4000 b.c. to 1800 b.c. (c. 5000-2500 B.C.), are elaborated with the aid of multivariate methods. A synoptical picture is presented describing biological affinities between the cultural groups concerned. The affinities are interpreted on the background of the geographical distances.
"Old Europe" cultures are confronted a) to their local and chronological successors, and b) to populations living in, or originating from, Eastern Europe, in order to work out - on the background of current theories on Indo-Europeanization and the expansion of Kurgan cultures - the biological elements potentially implied in the formation of the Corded Ware complex. The question of the phenotypical variability of the latter is investigated with respect to time and space (expansion); its biological incidence on the autochthonous populations (substratum) is analyzed. In parallel, the Corded Ware complex is confronted to the Bell Beaker complex, especially as to their morphological and cultural antagonism.
The great lines can be summarized as follows. Initially, two biological and geographical blocks were present: in Western Europe, the homogeneous complex of "Old Europe" populations; in Eastern Europe the Neolithic substratum and the quite different Kurgan groups. The biological effect of the expansion of the Kurgan traditions is evident in the regions adjacent to the North Pontic area, but it is fading out progressively with increasing distance from this center.
The Corded Ware complex s.l. is biologically heterogeneous. The local groups of the core area (Central Germany, Czechoslovakia, Poland) form a very homogeneous block, issued from the local "Old Europe" substratum and persisting until Aunjetitz at least. This block show no biological affinities to the Ukrainian Kurgan populations. There is no evidence for physical presence of Kurgan tribes in this area. Indo-Europeanization of Northern Europe could be explained by indirect Kurganization, i.e. by invasion of previously Kurganized neighbor groups.

The final phase of the European Neolithic is marked by the sudden appearance of two fast and far expanding cultural assemblies: the Bell Beaker and the Corded Ware complexes. In various respects both of them are involved in severe archaeological controversy: their origin, the modalities of their expansion and their impact on local substratum - biological and cultural - raise questions that have encountered an extraordinary variety of tentative answers.
As to the understanding of their history, in the recent years some real progress has been achieved concerning the former (Glockenbechersymposion Oberreid, 1974; Lanting and van der Waals, 1976; Gallay 1979), whereas for the latter - the Corded Ware complex - the general historical reconstruction is arrived at a dead end (1) [[footnote> See introductions of Häusler (1969) and Schwidetzky (1978a). <footnote]], despite of the fact that the knowledge on the local and regional level is steadily increasing.
Physical anthropology has been solicitated repeatedly (Gimbutas 1980; Schwidetzky 1978a, 1978b) to "referee" in this apparently unresolvable dispute and to intervene by forwarding biological arguments that are likely to contribute to a better understanding of these problems. As a matter of fact, physical anthropology has - potentially - an important role to assume in the reconstruction of "prehistoric" history: it has to complement cultural history (the evolution, in time and in space, of immaterial components - religious, aesthetical, technological) with a skeleton of factual history (the chronological succession of political events resulting from physical interaction between human groups standing behind these ideas). It has to intervene notably in the apparently endless debate of "diffusionism vs. migration" and to give insight into the modalities of cultural expansion by a comparative analysis of the biological properties of the cultural and geographical groups involved in the process under study.
Independently of the question, whether physical anthropology - at the present time - is able or not to undertake this fascinating task with reasonable chance of success, it is necessary to explain, at the outset of this study, the anthropological point of view of the situation we have to deal with. In order to give a contrasted picture, it is useful to come back to the Bell Beaker, the antagonist of the Corded Ware complex in Central and Western Europe.
To put it very bluntly, the Bell Beaker and the Corded Ware complexes can be regarded as being two very unlike twin brothers. Twin brothers, because they are partly contemporaneous, because partly they occupy the same regions and because both are brought in connection with Kurgan culture dynamism (Wave III; Gimbutas 1980); but unlike because of their physical type: Bell Beaker peoples - at least the ones in the center of their stronghold in Central Europe - have a very strongly expressed and unmistakable morphological individuality (usually tagged with the shorthand label of "planoccipitale Steilköpfe"), which constitutes an excellent marker of their biological penetrance on the substratum across the vast area they have spread.
The Corded Ware people on the other hand, are of a very common, ubiquitous, morphotype, that is encountered in large parts of Europe, since Early Neolithic through all the subsequent periods.
So, at first sight, the two main protagonists of the terminal phase of the Central European Neolithic raise very specific problems concerning the reconstruction of their biological and cultural origin: the Bell Beaker people - although being perfectly traceable on their expansion across Central and Western Europe (Gerhardt 1978; Menk 1980a) - are too "exotic" and can hardly be attached to any preexisting population in Europe, whereas the Corded Ware people - being too indistinctive with respect to their biological surrounding - are difficult to judge as to their biological and cultural connections, forwards and backwards in time, and across space.
These unfavorable starting conditions - discouraging at a first glance - make our problem even more challenging; and I think that physical anthropology, at present, is nevertheless likely to make major contributions to the historical reconstruction of the Corded Ware complex and - possibly - of the process of Indo-Europeanization of Central and Northern Europe. Three reasons must be evoked to justify our optimism:
1. Physical anthropology has undergone profound modifications - practically a complete substitution - of its methodology of data elaboration. This a direct consequence of the introduction of digital computers. Their essential impact is not to do usual work faster and with less effort, but to give new incentives to conceptual imagination, methodological creativity and transdisciplinary thinking, which altogether permit to undertake much more widely conceived studies, based on much more in-detail information, and to reach a much higher level of data integration and interpretation. This evolution has started in the late sixties and, after the time-consuming phase of building up the new infrastructure (program libraries, data banks), and of accumulating the experience to handle it, it begins now to yield. ... <>
2. ... <interdisciplinarity>

Objectives
The Corded Ware Complex has an extremely vast extension, comprising many geographical subgroups and cultural "associates." A useful and comprehensive compilation of the anthropological and archaeological problems has been given by Schwidetzky (1978a). This study also presents some very clear-cut conclusions - with which we widely agree - as to the morphological heterogeneity of the Corded Ware Complex (when considered in its widest sense), and to the apparent lack of morphological affinity to Kurgan culture populations. This is of particular interest in connection with the controversy about the origin of the Corded Ware complex and, thence, of the modalities of the process of Indo-Europeanization.
It is necessary, for a realistic understanding of its genesis, to take into consideration any human migration - and if so, what can be said as to their extent (geographical, demographical)? - or can it be fully explained with a model of cultural diffusionism?
What can be said about its own cultural and biological dynamism? To what extent is the expansion of the Corded Ware cultural traditions accompanied by movements of human groups (small units or entire populations)?
At any rate, whatever the problems are, it is insufficient to consider the Corded Ware complex only within a biologico-cultural context as delimited by its own geographical extension: it is essential to consider it on a (sub)continental level by integrating it into the phenomenon of Indo-Europeanization (immaterial aspects: ideological, linguistical, social), and by confronting it with the expansion of the Kurgan cultures (physical aspects: technoculture, human physical type).
In the present chapter the Corded Ware complex will be reconsidered therefore, within an extended reference framework, comprising for each region studied, representatives of: a) the local substratum; b) Corded Ware (and/or contemporaneous group); c) the chronological successors. With the aid of some relatively advanced biostatistical methods, biological arguments will be worked out in order to provide archaeologists with quantitative experiments to support - or discard - some of their hypotheses a) concerning the history of the Corded Ware complex, and b) concerning the implications of the Kurgan culture expansion in general, as currently considered (Gimbutas 1980).

Material
...
Methods
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Results
General overlook of Physical Anthropology
of Europe during Neolithic
In an earlier study (Menk 1975) we have presented an overall synthesis of the phenotype relationships between the cultural groups of the European Neolithic, as assessed by physical anthropology, by means of cranial morphology. It might be useful, at the outset of the considerations on Corded Ware and Kurgan cultures, to give a brief outline of some results that are interesting in the particular context of this study.
Despite the fact that some important complexes - such as Bell Beaker, Corded Ware, and Early Bronze Age cultures - were taken as entities with no further local subdivision, and that Kurgan groups were omitted, the essential elements concerning the settlement and the local evolution of European Neolithic populations are clearly demonstrated in the dendrogram (fig. 1).
Two main clusters are present, each one showing a time-relevant substructure:
A: Western cluster representing essentially "Old Europe" populations, introduced in Europe during Early Neolithic.
A1: true "Old Europe": Cardium Impresso, Linear Pottery and their cultural successors during Middle Neolithic until Early Bronze Age (Lagozza, etc.)
A2: essentially recent groups, including some with Bell Beaker influence.
A3: "Old Europe" groups, fully gracilized.
B: Eastern cluster, including Mesolithic representatives.
B1: residual cluster containing groups that show direct or indirect Kurgan influence.

Physical Anthropology of the Corded Ware Complex and the
Kurgan cultures
General outline of cranial morphology
A first synoptical view of the structure of morphological relationship between the groups submitted to this study is given in fig. 2. This scattergram - showing the 39 samples plotted according to the two most significant principal components - gives a quite meaningful summary, although it contains only about half of the total information. It represents in a well differentiated manner all the essential anthropological elements intervening in the historical scenario of this study:
1: "Old Europe" substratum: meso-dolichocranic, leptomorphic, gracile and rather small as to general size.
2: Bell Beaker Complex: brachycranic, meso-eurymorphic, medium in size.
3: Kurgan groups and associates: mesocranic, mesomorphic facial components (rather low orbitae, but tendency toward narrow nasal aperture), rather big in size.
4: Ukrainian neolithic substratum: extremely large in size and extraordinarily robust; dolicho-mesocranic, eurymorphic (very low orbitae and rather broad nose: "Palaeo-Europid," "Cromagnid").
This schematic layout of a wide score of representatives of prehistoric Europids (5) [[footnote> On the basis of the available cranial measurements the mediterranid and the nordid types are not easy to be distinguished. <footnote]] shows a cleavage of European humanity into two spheres which - before the onset of Kurgan "radiation" - were sharply differentiated and isolated: on one hand Western Europe with its typical mediterranid and nordid (6) [[footnote> All 39 groups are definitely Europid, except Afanasjevo that features for the - contested - Okunevo subgroup some mongolid traits in the facial skeleton (Debetz 1973, p. 159). <footnote]] stock of "Old European" civilizations and, on the other hand, Eastern Europe with its prevailing cromagnid morphotype, as represented by the Dnieper-Donets culture; the only mediterranid (and mediterranean) representative east of a line Vistula-Pruth being the Tripolye/Cucuteni culture. Then, as a consequence of the upheaval having occured during the transitional phase between final Neolithic and Early Bronze Age, two new entities emerge: a) the brachymorphic Bell Beaker people located astride of the continental (and morphological) cleavage mentioned before, and b) the lepto-dolichomorhic Corded Ware/Aunjetitz Complex as a sub-unit of the "Old Europe" morphotype.
Attention must be paid ... <graph characteristics>

Cluster Analysis: static interpretation
The dendrogram (fig. 3) - ... <>

The Eastern Cluster (B)
This cluster splits into two sub-units, representing the neolithic substratum: Dnieper-Donets (7) [[footnote> There is a problem concerning the cultural attribution of the sample named "Srednij Stog II". The skeletal material used in this study comes exclusively from the site of Kapulivka; according to its authors (Zinevich and Kruts 1968, p. 14), the archaeological material found in association with the skeletons speaks more in favor of an appurtenance to Srednij Stog II than to Dnieper-Donets. As to the human type, the skeletons belong, without any doubt, to the Dnieper-Donets populations. <footnote]] of the Ukraine (branch B1) and the core of the Kurgan complex (branch B2: Drevne-jamnaja, Srubnaja, Catacomb cultures), surrounded by some geographical neighbors (Afanasjevo, Andronovo, Western Siberian Neolithic), and by some potential cultural and/or biological associates (Central Russian Comb-pit Pottery culture, - East Baltic Boat-Axe culture, Cernavoda ( [[footnote> The Cernavoda sample represents one of the most heterogeneous groups of this study. This fact could reflect - to some extent - Kurgan influence (Wave I; Gimbutas 1980), but this explanation is not fully ascertained. Other possible reasons to explain this heterogeneity: small size of the sample; problems of internal chronology of the material (Necrasov, pers. comm.). <footnote]] ).

The Western Cluster (A)
This cluster too, subdivides into two historically relevant sub-clusters: "Old Europe" substratum (A1) and "intruders" (A2).
The Old Europe sub-cluster (branch A1) features practically all of the true "Old Europe" representatives (9) [[excluded footnote]] (Linear Pottery, Cucuteni, Gumelnita/Karanovo VI) and - witnessing the persistence of this stock - some later groups of the transition period (Zlota, Mierzanowice). In addition to this, we find half of the Corded Ware/Aunjetitz-conglomerate in this sub-cluster: local Corded groups from Central Germany and from Czechoslovakia, and Aunjetitz groups from Bohemia and Lower Austria (the population from the site of Gemeinlebarn clearly fits into the Aunjetitz type). Corded Ware people from Southwest Germany and Switzerland, however, represent a differentiated group (local variety of migrants according to Gerhardt and Strahm, 1975; Strahm 1979; Schwidetzky 1972; Sangmeister and Gerhardt 1965). The Comb-marked Pottery is only very loosely attached to this sub-cluster (low level of similarity). The affiliation of the Bohemian Bell Beaker to the "Old Europe" cluster is a striking example of an artefact due to insufficiently accurate cultural and chronological attribution of skeletal material (undoubtedly Aunjetitz people) (10) [[footnote> The Bohemian Bell Beaker sample (N = 32) contains 11 individuals from the site of Polepy, dated Bell Beaker/Aunjetitz. Theses 11 individuals, representing a homogenous (hyper)dolichocranic group (1 ultra-, 5 hyper-, 3 dolichocranic, 2 mesocranic), are likely to be predominantly Aunjetitzians, rather than Bell Beaker people. <footnote]]
The “intruder” sub-cluster (branch A2) also subdivides into two hightly significant units: Bell Beaker (A21) and “Kurganized Old Europeans” (A22). Whereas the former - pure-bred Bell Beaker (Gerhardt 1978; Menk 1979) from the core area of their subsequent diffusion (Central Germany, Moravia; Hainburg representing an Early Bronze Age survivor, perhaps a residual stronghold in a surrounding dominated by the Aunjetitz culture) - are obviously of extraneous origin, the latter (A22) are predominantly “Old European” as to their biological composition.
Biological “Kurgan” admixture (Wave II, according to Gimbutas 1980) can reasonably be admitted for the following South-Eastern groups: Usatovo 2, Globular Amphora culture, and Gorodsk-Horodistea-Foltesti. More comment will be given later.
For the North-Eastern and North-Central European groups there is probably no direct biological “Kurgan” admixture: East Prussian Corded Ware represents a local variety: “Old Europe” stock differentiated by microevolution (isolation). Fatjanovo must be interpreted as a migrant of Western (Corded Ware) origin. The Moravian and Central German Aunjetitz groups are affiliated to this cluster, rather than to the one of the remnant Aunjetitz groups, because - as a consequence of sampling difficulties (separation of Late Bell Beaker and Early Aunjetitz) - they contain some early material “contaminated” by Bell Beaker elements (Gerhardt 1953). The transition phase from Bell Beaker to Aunjetitz culture in Central Europe would merit a detail study. A satisfactory explanation is still to be found for the contradictional biological and cultural evolution: there seems to be a cultural continuity from Bell Beaker to Aunjetitz (Gallay 1980), but a complete rupture as regards the local human stock.

Dynamic interpretation of group affinities
... <graph characteristics>

Implantation of Kurgan populations in the Ukraine
Fig. 5, with the Dnieper-Donets culture as reference group (representing the substratum of Middle and Late Neolithic of the Ukraine), is clearly partitioned into four biologically and historically relevant complexes: a) Eastern Europid; a) Kurgan core; b) “Old Europe”; c) Kurganized “interface” between a) and b). With its very large gap between the substratum and the Kurgan groups, this figure suggests a complete population substitution: the morphological type encountered in the Dnieper-Donets culture representing the upper extreme robusticity of the Europid spectrum vanishes at the end of the Neolithic without leaving any trace (13) [[footnote> Concerning the apparent persistence until Srednij Stog II see note 6. <footnote]]. This means, of course, that migration of the Kurgan people must have set on earlier, from some area farther East (Southern Soviet Central Asia, probably with some North Caucasian influence Majkop culture (Sulimirski 1970: 130; Gimbutas 1961: 199). There is no evidence permitting to derive them from the Central Russian neolithic substratum (the hunting and fishing Comb-pit Pottery people) to whom the Kurgan people show remarkable morphological similarity, however.

Kurgan radiation
Fig. 6 - with the Drevnejamnaja (Jamna) culture serving as reference group - shows two zones, the first one being imbricated in the second: a) the Kurgan core and b) potential “Kurgan satellites,” the imbrication giving a graphical expression of biological Kurgan admixture: Usatovo, Gorodsk-Horodistea-Foltesti, East Baltic (Estonian) Battle-Axe, and Globular Amphora cultures.
As opposed to this Kurgan complex, we find the “Old Europe” sphere and - in between, as a transitional unit - the Bell Beaker groups and other groups being marked, to a variable degree, by their influence.
In opposition to each one of these three entities we observe the Ukrainian neolithic substratum. Thus, this graph (fig. 6) gives a particularly interesting picture of the biological composition of Neolithic and Metal Age Humanity in Eurasia.
The following groups merit some special comment. The Fat’janovo-Balanovo group, morphologically and culturally (Sulimirski 1970: 196) very close to the North-Central European Corded Ware groups, must be considered as a direct offshoot of the latter, having completely supplanted, by massive migration, the local Central Russian substratum (Comb-pit marked Pottery culture).
Another interesting case must be noticed here: the Estonian Battle-Axe culture. There is a very close phenotypical relationship between the three groups: Kurgan, Comb-pit Pottery, and Battle-Axe cultures (see also fig. 3). This brings physical anthropology in a delicate situation, i.e. to infer genetical links from phenotypical similarity, in a case where there are two potential ancestors: Kurgan and Comb-pit marked Pottery cultures. The similarity between the latter two must be considered either as being fortuitous (morphological convergence), or as reflecting some common early Central Russian substratum.
Cernavoda: this group - the chronological attribution of some of its skeletal material being currently reconsidered (Necrasov, personal communication) - appears in a “neutralized” position between Kurgan and Old Europe. Nevertheless, the presence of individuals of the “Kurgan” type is positively attested (Necrasov 1979). This group remains thus to be reexamined; one of the principal questions must be of demographical nature, i.e. to estimate the proportion of intruders with respect to the substratum.

“Old Europe” continuity in East-Central Europe
Fig. 7, with central German Linear Pottery in the origin of the graph, shows basically the same facts as explained above, but in a graphically reversed order. The morphological persistence of this stock is clearly demonstrated: it is first documented in the Linear Potter group, and it continues all the way through time, from Early Neolithic until Bronze Age (Aunjetitz) - with a short “intermezzo” staged by the Bell Beaker in Central Germany and in Czechoslovakia.
It must be stressed that most of the neighboring local Corded Ware groups fit perfectly into this pattern. The exceptions will be explained below.

Bell Beaker intrusion
The intrusive character of the Bell Beaker groups (“pure-bred” only; the particular case of the Bohemian group has been mentioned earlier) appears strikingly in fig. 8. Although being brought in relation with Kurgan Waves II and III (Gimbutas 1979), it must be stressed that this very peculiar human type has no particularly close biological affinities to the Kurgan populations. The problem concerning its geographical origin (homeland) beyond the North-Balkanic region of the Baden-Vucedol culture (for which the presence of this human type seems to be ascertained) remains open (Anatolia: Kalicz; Caucasas: Machnik, personal communication).

Heterogeneity of the Corded Ware complex (s.l.)
The bunch of geographical and cultural variants belonging to or brought in relation with, the Corded Ware complex (s.l.) splits into three categories (see figs. 2, 3, 9), each one with its own biological properties and cultural background.
1. Corded Ware core
The samples attributed to the core defined hereafter are: the local Corded Ware groups of Central Germany, Czechoslovakia, Poland and, as an offshoot, Fatjanovo.
A relatively well delimited area, comprising Central Germany, Poland and Czechoslovakia is inhabited by a remarkably homogeneous and autochthonous populace which - abstraction being made of the episodic appearance of the Bell Beaker people in the very same region - had held this territory since the Early Neolithic. Within the biological sphere of "Old Europe," to which they undoubtedly belong, Corded Ware people represent a somewhat "modernized" variety, characterized by a trend, away from the "archaiostenodolichomorphic" type, towards more eurymorphism. This detail could be of some interest (see below).
As essential parts of its economical and technocultural package seems to be of local outgrowth too (Sulimirski 1970: 154), this area - together with its human stock - can be admitted to be the base of the Corded Ware complex, cultural and biological.
2. Peripheral groups with strong biological affinity
to the Corded Ware core
The East Prussian group ("Baltic Haff culture") represents such a local variety, morphologically slightly diversified; influence of the local substratum, as admitted by Schwidetzky (1978: 260) or by genetical isolation. The case of the Southern Polish mixed Corded Ware (Zlota group) is not of special interest here.
Another group, of considerably more interest, is the westernmost Corded Ware satellite (Southwestern Germany, Switzerland). As mentioned earlier, this group is considered as an early offshoot of Central European origin, thus tracing back probably to the so-called "Einheitshorizont." Its morphological particularities (14) [[excluded footnote]] fit well into this model: as pointed out by Schwidetzky (1978: 260) the archaiostenodolichomorphic phenotype (its characteristics being probably amplified here by genetical isolation) seems to be clearly more frequent in the early phase of the Central German Corded Ware than in the later phase.
3. Peripheral groups with weak biological affinities
to the Corded Ware core
The case of the East Baltic Boat-Axe culture has already been discussed above. Two explanations can be considered, a) full "Kurgan" origin, or b) persistence of the Comb-marked Pottery substratum (Schwidetzky 1978: 260).
The Ukrainian groups of Gorodsk and Usatovo, from the point of view close to the ("Old European") Cucuteni/Tripolye substratum. <not my error
The last group to be taken into consideration is the Globular Amphora culture. It certainly assumes a key-stone function concerning the Kurganization of the Corded Ware complex. For the time being physical Anthropology cannot provide more than a tentative explanation (the skeletal material is still by far too poor to cover the huge area touched by this culture). It seems, however, that in the southern zone of its diffusion (Romania), the presence of individuals of genuine Kurgan type can be attested (Necrasov 1980). As to the northern zone, the biological incidence of the Kurgan radiation is probably fading out, as it does elsewhere. Detail studies remain to be done.

Conclusions
Indo-Europeanization of Central and Northern Europe
Both Kurgan cultures and Corded Ware/Battle-Axe assemblage are incontestably Indo-European. There is no doubt either, that the Indo-European component of the Corded Ware must be derived stringently from Kurgan: there are irrefutable chronological facts proving the anteriortity of Indo-European manifestations in Kurgan, and there is no room for polyphyletic hypotheses. Therefore, the problem of the origin of Indo-European traditions, as seen by Sulimirski (1970:155) ". . . An attempt to combine both ideas by deriving the Corded Ware cultures from the Yamnaya culture proved to be futile . . .", is not relevant any further, except for the fact that it underlines the necessity to give more consideration to the immaterial culture in historical reconstruction.
The fundamental question actually is: by which process diffusion or migration - did the transfer of this cultural package take place? It is not to play another round in the game "Diffusionists vs. Migrationists" (. . . and to see who can add another point to his score . . .). The whole relevance of the question situates at the economical, social, ideological and political level: What are the agents of cultural change, and what are its immediate consequences on the populations implied?
From the point of view of physical anthropology, the modalities can be outlined as follows. On the basis of the arguments presented up to here, Indo-Europeanization of northern Europe (i.e. of the Corded Ware culture s.str.) cannot have taken place by a direct invasion of whatever extent of South-Eurasian Kurgan people. As demonstrated by Schwidetzky (in this volume) there are virtually no individuals within the whole sample of German Corded Ware people that would fit, statistically, into the South-Ukrainian Kurgan populations.
Considering the irresistible success of the new Kurgan traditions - whose expansion (as witnessed by the presence of the new human type in the regions adjacent to the North-Pontic steppes) must have been borne by migrations - it seems reasonable to expect similar processes also for the Kurganization of peripheral regions. This further propagation was not carried out by North-Pontic Kurgan tribes, but by previously Kurganized local groups (such as perhaps Globular Amphora sub-groups). Two reasons must be taken into consideration to explain their supposed dynamism and mobility: a) a new thrust from the South-East by a successive Kurgan wave; b) intrinsic motivation due to the "cultural" Kurgan heritage, such as their new, patriarchal, social structure and new ideology involving the glorification of warfare.
Although the following hypothesis would be difficult to corroborate, it is not unreasonable to assume, for the Central European Corded Ware, the arrival of external biological elements, i.e. previously Kurganized groups (hybrids). As mentioned earlier, there seems to exist some morphological difference between early ("Einheitshorizont") and later Corded Ware populations: the disappearance of the "archaic" stenodolichomorphic type and an increased trend towards more eurymorphic forms as possibly vehiculated by these secondary Kurgan groups. Further studies would be necessary to determine whether these tendencies reflect admixture of such Kurganized groups.

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I think it is incredible such obsolete information is still spread as if it is current. The Bell Beakers are a 3rd mil BC offshoot of the westernmost tip of Corded Ware area, the Netherlands. Thus, there is not any controversy or contradiction. The physical BB type closely resemble the Dutch phenotype. The Bell Beakers did not only spread to the east - where indeed they met some Kurgan culture in the Aunjetitz Complex. They also spread to England, Ireland, Portugal, Italy. There is a strong case for assuming Celtic (or even Celto-Italic?) local continuity without any later migrations. So, having this clear, why not assume the intrusion of Indo European language in the same area where East and West met, this same Aunjetitz Complex, but instead having influences going east?