Paleolithic Papers #29

Genus Homo:

Rock art from Croatia from circa 34,000 years ago is figurative in nature.

Stone tools were recycled to new uses at a cave in Israel during the late Lower Paleolithic.

Hunter gatherers don't live in 'small' societies.

H. sapiens (Modern Humans):

Brain sizes have shrunk 10% in the last 40,000 years.

There is evidence of starchy food cooked in South Africa during the Mesolithic.

Is this the earliest known footprint from a human in the Americas?

H. neanderthalensis (Neandertals):

The Sima de los Huesas hominins get their age bracketed.

The first Neandertal fossil from Serbia has been found.

Could have aridification helped wipe out the neandertals?

Denisovans:

The Denisovans were two populations, at least, and may have actually been two different species.

A Denisovan jaw bone found in Tibet shows Denisovans colonized the 'roof of the world' long before modern humans did.  The jaw bone also starts to show what the Denisovans looked like.

H. antecessor:

H. antecessor was, at least once, a cannibal.

H. heidelbergensis:

Evidence from reexamining bovid remains from South Africa suggest active hunting was import for H. heidelbergensis.

H. luzonensis:

H. luzonensis, a new hominin from Luzon island of the Philippines, has been discovered. This hominin was another miniature standing at about an estimated 1.2m (5 ft). It may have suffered from island dwarfing like H. floresiensis, the so-called Hobbit.  John Hawks comments.

Hualongdong Hominin:

A hominin from China has a mosaic of primitive and modern features.  Some are claiming this is proof of the multiregional hypothesis.

H. erectus:

Evidence of what mammals H. erectus ate in Italy prior to 1.3 million years ago.

The dispersal routes out of Africa for hominins are explored in Sudan looking for stone tools.  John Hawks comments.

H. naledi:

Cranial remains from the Lesedi Chamber of the Rising Star Cave show some variation from the other fossils, but by and large appear to be more of H. naledi.

H. habilis:

The KNM-ER 64060 fossil mandible appears to be from H. habilis rather than H. erectus.

Genus Australopithecus:

A. sediba:

A sediba does not appear to be ancestral to modern humans.

META:

Man the Runner hypothesis is back again.

A troop of chimps deprived a leopard of its kill: how does that help model early hominins?

The history of human evolution can be seen in your face.

How important was the east african coastal forest for human evolution?

Basal ancestors of Humanity were upright apes.

Plovers Lake paleogenetics data might have been contaminated by modern people.

Paleolithic Papers #25

Genus Homo:

Stone tools found in China from the Pleistocene of the Levallois tradition hint at a potential local development of the technology.

A cave painting in Borneo in Indonesia dates from 40,000 years ago.

Inbreeding was common in hominins.

Crossing out of Africa was not difficult because the Arabian peninsula was green.

Hominins were not the cause the megafaunal extinctions in Africa, rather climate and the expansion of the grasslands were.  Unless, of course, the evidence for H. erectus purposefully expanding the grasslands with fire are accurate.

How did human language arise?  We don't really know.

How did members of the genus Homo survive in east Africa from paleolithic to mesolithic?

Analyzing Aurignacian tools using morphometrics.

A Russian site and its dating from the Upper Paleolithic is discussed and explored more.

H. sapiens:

The Lago Santa people had African-like features and were possibly Clovis culture descendants.  The peopling of South and Central America turned out to be fairly complicated.

The peopling of the Americas is getting a lot of interest once more with genetic studies.

Multiple types of projectiles found in Texas hint at potentially multiple migrations into the Americas.  Note: this could also be an example of a transition from one projectile point technology to another.

It seems the dispersals into the AMericas were more complex and hint at an Australasian component.

How did people cross the Wallace Line?

How the environment of northwestern Argentina changed across the Pleistocene/Holocene boundary.

People appear to have inhabited Tibet at least as early as 30,000 years ago.  This is much earlier than previously thought.

Star watching to understand the seasons may have very early origins.  Cave paintings from 40,000 years ago definitely suggest this.

Why do modern humans have round heads?

H. neanderthalensis:

Neandertals were just as violent as modern humans.

Neandertal children suffered from extreme stress during the winter.  Lead exposure was noted.

Neanderthals in the Caucasus transported obsidian over 250 km to make tools with.

Neandertal genes associated with neurogenesis in modern humans have been found.

H. erectus:

Are stone tools of the Acheulean style from 190k to 240k years ago a sign Homo erectus survived in Saudi Arabia until a late date?

H. erectus social behavior is discussed wrt an animal carcass. 

H. habilis:

Oldowon stone tools, the style associated with Homo habilis, have been found in Algeria dating from 2.4 million years ago.

Genus Australopithecus:

Little Foot, a likely A. africanus, is emerging from the stone matrix it was preserved in.

Little Foot's brain endocast suggests a more basal, chimpanzee like brain.

The original studies of A. africanus when it was known as A. prometheus are discussed.

Genus Paranthropus:

The scapular anatomy of P. bosei gets studied.

KNM-ER 47000 appears to be from P. bosei.

META:

U-Pb dating of flowstones from South Africa constrains the dates hominins were evolving there and shows they were living in dry climate conditions.

Trabecular Bone Fraction gets compared between modern humans, hominins and other primates.

The stone tool gripping abilities of modern humans, hominins and apes are compared.

3d analysis of bone tools sheds some light on how they were made and used.

Three plus different hominins coexisted in the early Pleistocene ~2 million years ago in the Omo-Turkana Basin (P. bosei, H.habilis and H. erectus. possibly H. rudolfensis as well).

What was the dietary diversity of early Pleistocene hominins?

The trabecular structure of the distal femur is compared between humans, apes and baboons is compared.

Paleolithic Papers #21

Genus Homo:

Why are human brains so large?  What genes make our brains grow so much larger than most other animals in relative terms?  Does the size come at a cost?

H. sapiens:

Who were the Nataruk people?

The Zhoukoudian Cave's human habitation is 35 thousand years old.

Mesolithic Mediterranean people's diet has been discovered via analysis of their teeth.

More evidence suggests modern humans colonized the Americas via the coastal route.

Paleogenetic evidence also suggests two different lineages did the colonization.

Mesolithic intestinal parasites have been found in Sweden.

Diets of the Niah Cave residents might be detectable from their mandibles.

The Clovis tech and skeletal remains from the Anzick site are, in fact, from the same time frame at the Holocene/Pleistocene boundary.

The interaction between modern humans and the archaic populations it replaced in Africa as it evolved needs to be examined.

Late Pleistocene tools in Sri Lanka show what plants the locals were eating at the time.

H. neanderthalensis:

How DID Neandertals hunt?  By not throwing, it appears, but by close-quarters thrusts and stabs.

New insights into the Neandertal thorax.

Denisovans:

Stone tools from the Denisovan cave were used to butcher animals.

H. erectus:

How H. erectus may have interacted with a lake margin ecology.

H. naledi:

Based on studying the teeth of H. naledi, it definitely appears to be a member of the genus Homo.

H. habilis:

The biomechanics of the OH 8 foot get examined.

Genus Australopithecus:

The cranial thickness of the StW 578 hominin (A. africanus, iirc) gets examined and similarities to modern humans are found, while differences from Paranthropus are uncovered as well.

The DIK-1-1f A. afarensis child has finally been described.  Among the interesting features is the child had ankles and feet that would help it climb trees, unlike the adults of the same species.  The big toe, as a child, was far, far more mobile than as an adult.  This would allow for grasping while climbing.  However, the child would lose this as it grew up.  Even as a child though, the Dikka hominin was definitely bipedal.

META:

The environment of 2 million years ago where hominins lived was wetter than previously thought.

Muscles thought to be uniquely human have been found in great apes.

How hominins leading to humans carved out their unique niche and how it differed from apes.

Studying breakage patterns on bones could have been produced by hominins.

Caution with studying collagen from prehistoric hominin fossils is warranted.

Large size might have evolved already by the time of the last common ancestor of humans and chimps.

Paleolithic Papers #18

Genus Homo:

Stone tools found in Attirampakkam, India push back the first occurrence of Levallois style stone tools.  200,000 years earlier than the previous occurrence.

John Hawks speculates about the potential for mitochondrial DNA introgression.

How to screw up stone tools.

H. sapiens:

The Indonesian island of Kisar is unusually rich in cave paintings.

It now appears that modern humans dispersed out of Africa multiple times prior to 60,000 years ago.

Humanity might be at its peak potential physically.

There is a bunfight over how to interpret South African mesolithic sites.

How deep into the Pleistocene did modern humans live in Indonesia?

The Out of Africa model is getting challenged again.

The Americas were peopled in one wave, by and large, for so implied by the genome of a 11,500 child found in Alaska from a new population from Holocene/Pleistocene Boundary Alaska.

Scandinavia was populated through two migrations at the end of the ice age.

A new jaw found in Israel of what appears to be a modern human pushes back the oldest date modern human remains have been found outside of Africa.  John Hawks has his own take.

At least four distinct populations of humans were present in Eurasia during the Late Pleistocene.

Archaeologists have reconstructed post ice age spear points from Holocene Boundary Alaska.

A Mesolithic 'crayon' may have been recovered from England.

The Bonn-Oberkassel dog found buried with two modern humans was very ill from distemper and would have required extensive care that would have made it useless as a helper or hunter for some time before its death.

H. neanderthalensis:

Were the Neandertals stymied by the glacial lakes of Siberia?

Neandertals appear to have collected hunting trophies.

Did the Neandertal home range get fragmented into smaller pockets due to climate change?

H. erectus:

Inner tooth morphology from the H. erectus finds of Zhoukoudian.

H. habilis:

Where OH24 and OH56 were found.

Genus Australopithecus:

A. africanus:

Little Foot has been prepared and shared with the world.

Genus Sahelanthropus:

John Hawks points out something weird is afoot with the Sahelanthropus femur.

META:

Human evolution has been uneven, punctuated.

A hypothesis has been proposed for the evolution of the digital sesamoids in the hominin line.

Taking a look at the materials of stone tools and their performance.

Lessons learned from the Piltdown doubters.

How hominins procured the raw materials for stone tools in the Lower Pleistocene.

Estimating body masses in hominins.

When did pair bonding become a thing in hominins?

Paleolithic Papers #2

Modern Humanity (Homo sapiens):

An infant was found buried with shells that are interpreted as ornamental from 74,000 years ago in Africa.

Melanesians have both Neandertal and Denisovan genes. Paper link.

It seems modern Humans and Neandertals interbred at least 5 times in the last 60,000 years.

Neandertals (Homo neanderthalensis):

Isotopic evidence shows Neandertals were omnivores.

The Sima de los Huesos hominins have been called early Neandertals now. This may spark a academic bun fight because they were declared distinct from Neandertal and Denisovan this past year.   Nature has a pop sci write up on it, too.

Homo antecessor:

The oldest known animal butchery in Europe has been discovered in Thuringa, Germany dating from 1.07 Million Years ago. This predates the Neandertals.

Pliocene/Pleistocene Olduvai Gorge Hominin Habitat:

The habitat of Paranthropus bosei and Homo habilis has been reconstructed and it was far from a paradise.

Homo habilis & Paranthropus boisei Pleistocene Quaternary Habitat was NOT the Garden of Eden

Scientists have pieced together an early human habitat for the first time, and life was no picnic 1.8 million years ago.

Our human ancestors, who looked like a cross between apes and modern humans, had access to food, water and shady shelter at a site in Olduvai Gorge, Tanzania. They even had lots of stone tools with sharp edges, said Gail M. Ashley, a professor in the Rutgers Department of Earth and Planetary Sciences in the School of Arts and Sciences.

But "it was tough living," she said. "It was a very stressful life because they were in continual competition with carnivores for their food."

During years of work, Ashley and other researchers carefully reconstructed an early human landscape on a fine scale, using plant and other evidence collected at the sprawling site. Their pioneering work was published recently in the Proceedings of the National Academy of Sciences.

The landscape reconstruction will help paleoanthropologists develop ideas and models on what early humans were like, how they lived, how they got their food (especially protein), what they ate and drank and their behavior, Ashley said.

link.

When did the Genus Homo get Large?

Spatial and temporal variation of body size among early Homo

Authors:

Will et al

Abstract:

The estimation of body size among the earliest members of the genus Homo (2.4–1.5 Myr [millions of years ago]) is central to interpretations of their biology. It is widely accepted that Homo ergaster possessed increased body size compared with Homo habilis and Homo rudolfensis, and that this may have been a factor involved with the dispersal of Homo out of Africa. The study of taxonomic differences in body size, however, is problematic. Postcranial remains are rarely associated with craniodental fossils, and taxonomic attributions frequently rest upon the size of skeletal elements. Previous body size estimates have been based upon well-preserved specimens with a more reliable species assessment. Since these samples are small (n less than 5) and disparate in space and time, little is known about geographical and chronological variation in body size within early Homo.

We investigate temporal and spatial variation in body size among fossils of early Homo using a ‘taxon-free’ approach, considering evidence for size variation from isolated and fragmentary postcranial remains (n = 39). To render the size of disparate fossil elements comparable, we derived new regression equations for common parameters of body size from a globally representative sample of hunter-gatherers and applied them to available postcranial measurements from the fossils.

The results demonstrate chronological and spatial variation but no simple temporal or geographical trends for the evolution of body size among early Homo. Pronounced body size increases within Africa take place only after hominin populations were established at Dmanisi, suggesting that migrations into Eurasia were not contingent on larger body sizes. The primary evidence for these marked changes among early Homo is based upon material from Koobi Fora after 1.7 Myr, indicating regional size variation. The significant body size differences between specimens from Koobi Fora and Olduvai support the cranial evidence for at least two co-existing morphotypes in the Early Pleistocene of eastern Africa.

Reconstructed Homo habilis Suggests Homo (Human) Genus Family Tree Rather Bushy

Reconstructed Homo habilis type OH 7 suggests deep-rooted species diversity in early Homo

Authors:

Spoor et al

Abstract:

Besides Homo erectus (sensu lato), the eastern African fossil record of early Homo has been interpreted as representing either a single variable species, Homo habilis1, or two species. In the latter case, however, there is no consensus over the respective groupings, and which of the two includes OH 7, the 1.8-million-year-old H. habilis holotype. This partial skull and hand from Olduvai Gorge remains pivotal to evaluating the early evolution of the Homo lineage, and by priority names one or other of the two taxa. However, the distorted preservation of the diagnostically important OH 7 mandible has hindered attempts to compare this specimen with other fossils. Here we present a virtual reconstruction of the OH 7 mandible, and compare it to other early Homo fossils. The reconstructed mandible is remarkably primitive, with a long and narrow dental arcade more similar to Australopithecus afarensis than to the derived parabolic arcades of Homo sapiens or H. erectus. We find that this shape variability is not consistent with a single species of early Homo. Importantly, the jaw morphology of OH 7 is incompatible with fossils assigned to Homo rudolfensis and with the A.L. 666-1 Homo maxilla. The latter is morphologically more derived than OH 7 but 500,000 years older, suggesting that the H. habilis lineage originated before 2.3 million years ago, thus marking deep-rooted species diversity in the genus Homo. We also reconstructed the parietal bones of OH 7 and estimated its endocranial volume. At between 729 and 824 ml it is larger than any previously published value, and emphasizes the near-complete overlap in brain size among species of early Homo. Our results clarify the H. habilis hypodigm, but raise questions about its phylogenetic relationships. Differences between species of early Homo appear to be characterized more by gnathic diversity than by differences in brain size, which was highly variable within all taxa.