Stratigraphy

Archaeologists have identified seven archaeological layers at Okladnikov Cave.^[2]

Artefacts

Nearly 4000 lithic tools have been recovered from Okladnikov Cave.^[2] Mousterian artefacts are found throughout all seven layers.^[3] The tool assemblage consisted mostly of scrapers and scraper-knives.^[5] Around a quarter of the tools at Okladnikov Cave were made from jasperoids, while around 5% were made from hornstones.^[5]

The lithic industry at Okladnikov Cave shares most similarities with another site in the Altai-Sayan region, Chagyrskaya Cave, and are rather distinct from other Altai sites.^[5] However, unlike at Chagyrskaya Cave, Levallois-type tools are uniquely found at Okladnikov Cave.^[5] Both sites contain a great number of Neanderthal/Mousterian stone tools.^[6] The lithic culture was initially referred to as the Altai Mousterian; nowadays, the culture is more commonly referred to as the Sibiryachikha culture^[5][6] or the Sibiryachikha variant.^[4]

Fauna

Over 6000 animal fossil elements were discovered at the cave, representing at least 20 different species. The remains of marmot, gray wolf, red fox, bear, horse, cave hyena, woolly rhinoceros, reindeer, steppe bison, red deer, Siberian ibex and argali sheep were commonly found inside the cave, with a heavy presence of cave hyena and woolly rhinoceros remains.^[2][3] Some beaver, Panthera spelaea and red wolf remains were also discovered.^[2]

The heavy presence of cave hyena remains indicate that the cave was most likely intermittently shared between cave hyenas and hominins.^[2]

Diet

Comparative studies on diet show that Neanderthals from the Altai-Sayan region lived in a manner similar to that of late European Neanderthals. Both show signs of being specialized hunters who were likely dependent on the subsistence hunting of large herbivores.^[7]

Hominin fossils

168 hominin fossil elements were discovered at the cave, with the majority coming from adults.^[2] The hominin remains include five teeth and nine cranial fragments, most likely representing at least four distinct individuals.^[6] Archaeologists had long suspected that the fossil hominin remains belonged to Neanderthals; however, some had argued that the remains belonged to humans with mixed Homo erectus traits.^[8] Rather fragmented and consequently hard to classify, morphological comparisons with Neanderthals did not produce definitively convincing results.^[8] This question was resolved through the successful application of DNA testing to some of the hominin fossil remains.^[8]

Archaeogenetics

In 2007, researchers from the Max Planck Institute for Evolutionary Anthropology succeeded in extracting DNA from two fossil hominin fragments from Okladnikov Cave: the humeral diaphysis of a juvenile and a separate femur fragment.^[8][6] mtDNA sequencing confirmed that both fragments most likely belonged the same individual, dubbed Okladnikov 2.^[6][8][10] The mtDNA sequences of the HVR I (hypervariable region I) from Okladnikov 2 confirmed that the individual was Neanderthal.^[6][8] On the basis of mtDNA analysis, Okladnikov 2 was found to be more related to European and western Asian Neanderthals.^[8] A 2014 re-analysis teasing out ancient DNA from contaminated sequences allowed researchers to complete the mtDNA sequence from Okladnikov 2. The completed sequence shows that the Okladnikov 2 mtDNA is basal to that sequenced from Mezmaiskaya 1 from Mezmaiskaya Cave and is even closer to western Neanderthals than previously thought.^[10]