Manuel Dominguez-Rodrigo

Complutense University of Madrid | UCM · Department of Prehistory

Taphonomic works aim at discovering how paleontological and archaeofaunal assemblages were formed. They also aim at determining how hominin fossils were preserved or destroyed. Hominins and other mammal carnivores have been co-evolving, at least during the past two million years, and their potential interactions determined the evolution of human be...

The identification of anthropogenically-modified carnivoran bones in archaeological sites is rare in Pleistocene contexts, especially in the most ancient periods. Neanderthal groups have clearly shown a great variety of subsistence activities and the use of carnivoran resources, until rare, is also present in some archaeological sites. However, th...

Objective analytical identification methods are still a minority in the praxis of paleobiological sciences. Subjective interpretation of fossils and their modifications remains a nonreplicable expert endeavor. Identification of African bovids is a crucial element in the reconstruction of paleo‐landscapes, ungulate paleoecology, and, eventually, hom...

Olduvai Gorge (Tanzania) is an archaeological and paleontological locality situated in north of Tanzania. It contains seven geological sedimentary units that span the evolution of humans and their ecosystems over the past two million years. The Olduvai archaeological record has been used as the main contrasting background against all the early homi...

FLK West (Bed II, Olduvai Gorge) contains the oldest association of Acheulian stone tools and exploitation of fauna (including megafauna) by hominins in the Pleistocene. Recently, the FLK West paleolandscape has been intensively studied, unveiling a spatial association between archaeological materials and hydrothermal resources. A new type of lands...

Kill/butchering sites are some of the most important places for understanding the subsistence strategies of hunter-gatherer groups. However, these sites are not common in the archaeological record, and they have not been sufficiently analysed in order to know all their possible variability for ancient periods of the human evolution. In the present...

FLK North (FLK N) (Bed I, Olduvai Gorge, Tanzania) is one of the best examples of a palimpsest where felids, hyenids and hominins made use of the same space without or with minimal interaction between hominins and the other two carnivores. Felids have been interpreted as the main accumulators and carcass consumers followed by frequent hyenid interv...

Here, we present a thorough taphonomic analysis of the 1.84 million-year-old site of Phillip Tobias Korongo (PTK), Bed I, Olduvai Gorge. PTK is one of the new archaeological sites documented on the FLK Zinj paleolandscape, in which FLK 22 level was deposited and covered by Tuff IC. Therefore, PTK is pene-contemporary with these sites: FLK Zinj, DS,...

Early human presence in America still is a contentious issue in Anthropology. Recent evaluation of bone surface modifications on remains of Lestodon in the 30,000 year-old Arroyo del Vizcaíno (ADV) site (Uruguay) by objective computer vision methods have been contested on non-taphonomic grounds, by criticizing the algorithms used to interpret them....

The major raw material documented in the archaeological sites of Olduvai Gorge (Tanzania) is a geological material with crystalline appearance, white or colorless, foliated or seemingly massive only at the outcrop scale, with a very high quartz-rich composition, and apparently bearing a metamorphic origin (CQRM). Since the early days of research in...

SIGNIFICANCE: The hypothesis that >1500 Middle Pleistocene hominin bones represent the remains of complete corpses deposited deliberately in Rising Star Cave by conspecifics is provocative. This is because intentional handling of dead bodies might imply these hominins had developed a uniquely human sense of mortality salience >235 000 years ago. We...

In recent years, a “high-resolution” archaeological approach is being successfully applied in a number of Paleolithic intra-site spatial analyses. This perspective encompasses the integration of data provided by a number of sources (such as soil micro-morphology, archaeo-stratigraphy, site formation studies, or lithic conjoining) in order to identi...

Human carnivory is atypical among primates. Unlike chimpanzees and bonobos, who are known to hunt smaller monkeys and eat them immediately, human foragers often cooperate to kill large animals and transport them to a safe location to be shared. While it is known that meat became an important part of the hominin diet around 2.6–2 Mya, whether intens...

Olduvai Gorge (Tanzania) is a key site for the study of human evolution as well as the origin of modern humans and the Middle Stone Age (MSA). In this study, we present a new MSA location named Dorothy Garrod Site (DGS), found in the main branch of Olduvai Gorge. The site has only one archaeological level, located stratigraphically in the Upper Ndu...

Misiam is a modern wildebeest-dominated accumulation situated in a steep ravine covered with dense vegetation at Olduvai Gorge (Tanzania). It is interpreted here as a leopard lair to which carcasses have been transported for several years. Felid-specific bone damage patterns, felid-typical skeletal part profiles, taxonomic specialization and the ph...

Some researchers using traditional taphonomic criteria (groove shape and presence/absence of microstriations) have cast some doubts about the potential equifinality presented by crocodile tooth marks and stone tool butchery cut marks. Other researchers have argued that multivariate methods can efficiently separate both types of marks. Differentiati...

Outstanding questions about human evolution include systematic connections between critical landscape resources—such as water and food—and how these shaped the competitive and biodiverse environment(s) that our ancestors inhabited. Here, we report fossil n-alkyl lipid biomarkers and their associated δ13C values across a newly discovered Olduvai Gor...

Apex predators play an important role in the top-down regulation of ecological communities. Their hunting and feeding behaviors influence, respectively, prey demography and the availability of resources to other consumers. Among the most iconic—and enigmatic—terrestrial predators of the late Cenozoic are the Machairodontinae, a diverse group of big...

Since 2006, The Olduvai Paleoanthropology and Paleoecology Project (TOPPP) is conducting intensive research in a number of classical and newly discovered sites throughout the sequence of Olduvai Gorge, in Tanzania. Over these fifteen years of intense fieldwork, efforts have mostly focused on the Oldowan and Acheulean evidence located in Bed I and B...

Los yacimientos de la Garganta de Olduvai (Tanzania) constituyen un enclave único para el estudio de los primeros representantes del género Homo. La buena preservación de estos yacimientos y la cantidad de fósiles hallados en ellos posibilita que se sigan desarrollando excavaciones arqueológicas en este lugar. El equipo de investigación The Olduvai...

Meat eating is one of the hallmarks of human evolution. It has been linked to the beginning of stone tool use, to physiological changes leading to crucial anatomical transformations defining our genus, and to new socioreproductive and cognitive behaviors. Uncontroversial evidence of meat eating goes back to 2.6 million years ago; however, little is...

Identifying how early humans flaked stone tools is one of the crucial elements in hominin evolution. Here, we show that equids can sometimes also produce equally complex cores with conchoidal breakages that exhibit the characteristics of intentionally-flaked hominin artefacts by bipolar technique and methods. As a result, sharp edged flakes with pe...

The implementation of deep-learning methods to the taphonomic analysis of the microscopic modification of bone-surface modifications exposed to different chemical diagenetic pathways can effectively discriminate between acidic and alkaline soil properties, indirectly reflecting different ecological conditions. Here we use this novel method to asses...

Artificial intelligence algorithms have recently been applied to taphonomic questions with great success, outperforming previous methods of bone surface modification (BSM) identification. Following these new developments, here we try different deep learning model architectures, optimizers and activation functions to assess if it is possible to iden...

In this study, we focus on a newly discovered Early Pleistocene archaeological site – AGS (Alberto Gómez Site) – at Olduvai Gorge in Northeast Africa to identify coeval landscape resources via a multi-proxy perspective. We explore the distribution of four major compound classes (n-alkanes, n-alcohols, n-alkanoic acids, and sterols) and leaf-wax δ13...

Humans are unique in their diet, physiology and socio-reproductive behavior compared to other primates. They are also unique in the ubiquitous adaptation to all biomes and habitats. From an evolutionary perspective, these trends seem to have started about two million years ago, coinciding with the emergence of encephalization, the reduction of the...

The earliest widely accepted presence of humans in America dates to approximately 17.5 cal kyr BP, at the end of the Last Glacial Maximum (LGM). Among other evidence, this presence is attested by stone tools and associated cut-marks and other bone surface modifications (BSM), interpreted as the result of the consumption of animals by humans. Claims...

DS (David’s site) is one of the new archaeological sites documented in the same paleolandscape in which FLK 22 was deposited at about 1.85 Ma in Olduvai Gorge. Fieldwork in DS has unearthed the largest vertically-discrete archaeological horizon in the African Pleistocene, where a multi-cluster anthropogenic accumulation of fossil bones and stone to...

Probably, one of the biggest questions about the Acheulean is focused on the functional aspects of its lithic industry and, more specifically, its link to subsistence activities developed by hominins during the Early Stone Age. Historically, tecno-functional research on ESA techno-complex has focused on the role played by flakes and LCT in the proc...

Deep learning models are based on a combination of neural network architectures, optimization parameters and activation functions. All of them provide exponential combinations whose computational fitness is difficult to pinpoint. The intricate resemblance of the microscopic features that are found in bone surface modifications make their differenti...

Industrialization has impacted the human gut ecosystem, resulting in altered microbiome composition and diversity. Whether bacterial genomes may also adapt to the industrialization of their host populations remains largely unexplored. Here, we investigate the extent to which the rates and targets of horizontal gene transfer (HGT) vary across thousa...

The TD6 unit of the Gran Dolina contains an assemblage of the Early Pleistocene, interpreted firstly as a home base. More recently has been proposed a transported origin of the remains according to the sedimentology. Following this model, the remains should be dragged or lagged in a predictable pattern related to their weight, density, shape, and s...

Here, we present the first three-dimensional taphonomic analysis of a carnivore-modified assemblage at the anatomical scale of the appendicular skeleton. A sample of ten carcasses composed of two taxa (zebra and wildebeest) consumed by wild lions in the Tarangire National Park (Tanzania) has been used to determine element-specific lion damage patte...

An amendment to this paper has been published and can be accessed via a link at the top of the paper.

The balance of power (that is the dominance on the predation arena between carnivore competitors and hominins) remains controversial. One reflection of this is the carnivore modification of hominin bones. During human evolution, hominins were first prey and then predators of other animals, including carnivores. Modifications reported on some homini...

Bone surface modifications (BSMs) in faunal assemblages are frequently used to infer past agency and actions of hominins and carnivores, with implications for the emergence of key human behaviours. Patterning of BSMs has mostly been defined as a combination of the intensity of marks per bone portion and sometimes per element. Numerous variables inv...

In this paper, we apply Machine Learning (ML) algorithms to study the differences between Discoid and Centripetal Levallois methods. For this purpose, we have used experimentally knapped flint flakes, measuring several parameters that have been analyzed by seven ML algorithms. From these analyses, it has been possible to demonstrate the existence o...

Equifinality constitutes a challenge when interpreting agency in archaeological sites. The fact that a specific type of damage frequently cannot be linked to a single actor, behavior, or ecological context, handicaps correct interpretations of site formation processes. Actualistic studies have been used to address this type of problem by creating m...

Bone surface modifcations are foundational to the correct identifcation of hominin butchery traces in the archaeological record. Until present, no analytical technique existed that could provide objectivity, high accuracy, and an estimate of probability in the identifcation of multiple structurally- similar and dissimilar marks. Here, we present...

Significance Molecular fossil biomarkers illuminate a geothermally active oasis landscape at Olduvai Gorge 1.7 Ma at the emergence of the Acheulean technology. This study on the local paleolandscape reveals a mosaic ecosystem with great biodiversity, rivers, edible resources, and hydrothermal features. Evidence of hydrothermalism was found near sit...

Taphonomists have long struggled with identifying carnivore agency in bone accumulation and modification. Now that several taphonomic techniques allow identifying carnivore modification of bones, a next step involves determining carnivore type. This is of utmost importance to determine which carnivores were preying on and competing with hominins an...

In this paper we present the experimental results obtained for the formation of use-wear traces on four types of basalt rocks from the Olduvai Gorge (Tanzania) and one from the Deba River (Spain). The objective of this study is to create a reference collection that will allow the posterior analysis and identification of archeological use-wear trace...

Horizontal Gene Transfer, the process by which bacteria acquire new genes and functions from non-parental sources, is common in the human microbiome. If the timescale of HGT is rapid compared to the timescale of human colonization, then it could have the effect of "personalizing" bacterial genomes by providing incoming strains with the genes necess...

Cut marks exposed to a short period of trampling were easily differentiated from trampling marks. Here, through the combined use of cross-validated logistic regression, mixed-effect regression models and computer vision deep learning methods, we approach the timing and modification rate of the microscopic variables that characterize cut marks. This...

Accurate identification of bone surface modifications (BSM) is crucial for the taphonomic understanding of archaeological and paleontological sites. Critical interpretations of when humans started eating meat and animal fat or when they started using stone tools, or when they occupied new continents or interacted with predatory guilds impinge on ac...

This paper presents for the first time an experimental protocol for the assessment of use-wear produced when using Precambrian and metamorphic white Naibor Soit quartzite (NQ) flakes. NQ is the most recurrent raw material from the archaeological sites of the Olduvai Gorge during the Early Stone Age (ESA). The objective of this study is to provide a...

The analysis of bone breakage has always been underrepresented in taphonomic studies. Analysts, thus, lose the opportunity to resolve an important part of the equifinality related to activities that hominins and different types of carnivores may produce. Recent studies have shown that the use of powerful machine learning (ML) algorithms allow the a...

To understand the identity of the early Acheulean, it is necessary to discriminate between the variables that influenced the selection of technological strategies. Functionality of the archaeological sites is crucial in assessing the manufacturing strategies of lithic tools. To achieve this goal, analysis of the post-depositional processes must be...

The mineralogical composition of the clay stratum (level 22) that contains the FLK Zinj-DS-PTK-AMK complex, the only example of pene-contemporaneous early Pleistocene sites occurring on the same palaeolandscape and simultaneously covered by the same ash fall tuff, shows significant intra-site and inter-site differences. Overall, level 22A is relate...

Olduvai site integrity has been questioned through interpretations of fluvial inputs on most assemblages from Beds I and II that rest on a contradictory use of taphonomic variables, lack of geological support, and lack of adequate experimentally-supported referential frameworks. Most variables used to address fluvial impact in faunal assemblages ha...

Taphonomic studies, along with modern analogs arisen from experimentation, have been developed to discern the agents responsible for bone accumulations. A special focus has been given to carnivores, which may produce bone accumulations or interact with hominins by ravaging bones from archaeological sites. Although a great effort has been made to st...

The Oldowan-Acheulean transition shows remarkable variability in Olduvai Bed II. To explain this, M. Leakey formulated a cultural model whose most distinctive contribution was the introduction of two cultural traditions (Developed Oldowan A and B) between the Oldowan and the Acheulean. This model has been discussed for the last fifty years, giving...

The Lower Pleistocene site of Bell's Korongo (BK) in Olduvai Gorge (Tanzania) has been a key site for the study of the origin of human behaviour. The lower archaeological levels of BK are characterized by anthropogenic activity related to the exploitation of megafauna (elephant, hippopotamus, Sivatherium) and smaller game (zebra, wildebeest and ant...

Here, I show that powerful machine learning (ML) algorithms can efficiently classify most BSM of any given controlled experimental assemblage. In some cases, classification may reach an accuracy of 100%. No other statistical tool commonly used in taphonomy had been this successful at classification before. However, the heuristics of ML algorithms d...

Defining the time that any given archaeofaunal assemblage took to be accumulated is challenging. Understanding the time variable is crucial to interpret how early sites were formed and what these sites represent in terms of hominin behavior. Two complementary dental analysis techniques (microwear and mesowear) have been used to understand dietary n...

The association of stone tools and modified bones at archaeological African Plio-Pleistocene sites is essential to understanding the socio-economics of early hominin behavior. Previous research at BK suggests the site was repeatedly visited by hominins for short time periods. During these occupations, the hominins had a primary role in the exploita...

Excavations at Bell Korongo (BK) have yielded important evidence to infer different behaviours of early hominins in several archaeological levels since 1935. The present study shows the results for a newly geological and archaeological of BK (Level U3.1). This paper describes the geology of this newly discovered level, along with a taphonomical ana...

Hominin encephalization has been at the center of debates concerning human evolution with a consensus on a greater role for improved dietary quality. To sustain the energetic demands of larger brains, cooking was likely essential for increasing the digestibility and energy gain of meat and readily available, yet toxic starches. Here, we present the...

Humans are the only primates that maintain regular inter-group relationships and meta-group social networks that enable the inter-group flow of individuals. This is the basis of the band/tribe concept in the anthropology of modern foragers. The present work is a theoretical approach to the development of analytical tools to understand group size an...

The identification of cut marks and other bone surface modifications (BSM) provides evidence for the emergence of meat-eating in human evolution. This most crucial part of taphonomic analysis of the archaeological human record has been controversial due to highly subjective interpretations of BSM. Here, we use a sample of 79 trampling and cut marks...

Categorical variables identifying microscopic features of cut marks produce high accuracy in discrimination of bone surface modifications, but are vulnerable to variable degrees of inter-analyst subjectivity. Metric analyses of cut mark width and depth are presented by Merritt et al. (2018) as a more objective method of identifying cut marks. Howev...

Carnivore bone modification has been one of the targets of taphonomic research during the last decades. Discerning carnivore involvement in the archaeo-paleontological record during the Plio-Pleistocene is especially important due to the capability of several carnivores of creating bone assemblages, to the interaction with other species in the modi...

The FLK West sequence is divided into six fluvial stratigraphic levels, each of which provided archaeological materials. In the present paper we outline the major similarities and differences displayed by the lithic assemblages in FLK W, particularly the lower assemblages, which have yielded more objects than the upper ones. The differences noted i...

Traditional taphonomic analyses do not consider the emergent properties resulting from the relationship of variables. Several of these emergent properties are expressed spatially. Here, we present a spatial taphonomic approach to the understanding of post-depositional processes affecting experimental assemblages modified by fluvial currents. Spatia...

The study of cut marks in archaeological contexts is of great importance for understanding the subsistence strategies of past human groups. Many authors have indicated differences to exist between the cut marks produced by different tools and when the same types of tool have been made from different raw materials. The present work examines the cut...

This paper presents a detailed analysis of the bifacial shaping and the spatial distribution of 85 bifaces recorded in an area of 51.9 m2 on the Lower Floor of the TK site, located alongside the Trench I excavated by M. Leakey in 1963. The repeated use of shaping schemes and patterns demonstrates that the knappers who produced these tools had a goo...

The analysis of bone surface modifications (BSMs) is a prominent part of paleoan-thropological studies, namely taphonomic research. Behavioral interpretations of the fossil record hinge strongly upon correct assessment of BSMs. With the significant impact of microscopic analysis to the study of BSMs, multiple authors have discussed the reliability...

In a previous article, we presented an innovative method to analyze cut marks produced with metal tools on animal bones from a metrical and tridimensional perspective (Maté-González et al. 2015). Such analysis developed a low-cost alternative technique to traditional microscopic methods for the tridimensional reconstruction of marks, using their me...

All models of evolution of human behaviour depend on the correct identification and interpretation of bone surface modifications (BSM) on archaeofaunal assemblages. Crucial evolutionary features, such as the origin of stone tool use, meat-eating, food-sharing, cooperation and sociality can only be addressed through confident identification and inte...

Significance Awareness of self-mortality is a uniquely human capacity. Ritualistic treatment of corpses reflects this realization. Two large assemblages of fossil human bones from Spain (Sima de los Huesos, SH) and South Africa (Dinaledi Chamber, DC) are offered as the earliest evidence for mortuary behavior. This interpretation implies that humans...

The use of innovative techniques such as micro-photogrammetry and geometric morphometrics may have a major impact on the differentiation of cut marks made with different raw materials and, thus, link butchering processes with stone tool reduction sequences. This work focuses on a sample of cut-marked bones from the Bell's Korongo (BK) site (Upper B...

A series of experimental cut marks have been analyzed by eleven taphonomists with the goal of assessing if they could identify similarly 14 selected microscopic variables which would identify those marks as cut marks. The main objective was to test if variable identification could be made scientifically; that is, different researchers using the sam...

The Oxford Handbook of the Archaeology of Diet aims to provide a survey of both the diversity of human diet in the past as well as providing solid information on the many approaches to the topic. Thus the aim was not just to present what we know, but how we gain that understanding. The first section presents research on the diets of non-human prima...

Tool design: Dihedrals. (XLS)

Tool functioning: Shape and size. (XLS)

Results of the statistical tests. Table A. Blanks. Types of blanks sorted by types of reduction intensity (RI) and type of artifact (Tp). (b/s = block/slab). Table B. Dihedrals. Edges attributes sorted by types Reduction Intensity (RI: RI0 = 0.00; RI1 = 0.25; RI2 = ≥0.25 <0.50; RI3 = ≥0.50–1) and Operative Index (OI) (mn = mean; u = unmodified; m =...

Tool design: Shape and size. (XLS)

Tool functioning: Dihedrals. (XLS)

Before sedimentation, bones are exposed to an important amount of biostratinomic taphonomic processes. One of them is related to the action of carnivores, which is reflected in conspicuous tooth marks, such as pits, scores, punctures or furrowing. Different carnivores damage bone assemblages differently. Thus, several researches have tried to ident...

The Acheulean materials documented in FLK West dated c. 1.7 Ma. are the focus of the present work. An original techno-functional approach is applied here to analyze the origin of Acheulean tools. According to the results, these tools were employed in different functional contexts in which tasks of different durations that transformed resources with...

Cut mark studies have experienced a useful development in the last few years. These studies have allowed us to obtain important information about human prehistory spanning from the origin of meat consumption for chronologies around 2.5 Ma, the detection of human hunting behavior during the lower Pleistocene, or even to determine the uses of diverse...