Jinniushan

Jinniushan is a Middle Pleistocene paleoanthropological site, dating to around 260,000 BP, most famous for its archaic hominin fossils. The site is located near Yingkou, Liaoning, China. Several new species of extinct birds were also discovered at the site.

Jinniushan hominin
The hominid fossils at Jinniushan all belong to one individual. Initially, the fossils were believed to have belonged to a male specimen, since the fossils were so big. Later analysis shows that the fossil remains actually come from a female specimen.

Size
The Jinniushan specimen's body mass is estimated to be around 78.6 kg, making it the largest female specimen ever discovered in the fossil record. The next largest female specimen ever discovered, found at Grotte du Prince, early Late Pleistocene, from around 100,000 BP, has an estimated body mass of 74 kg.

Body size in Homo reached its maximum during the Middle Pleistocene, so the size of the Jinniushan specimen is not surprising, especially since the specimen was found at a high latitude, cold climate location. In accordance with Allen's rule and Bergmann's rule, the large body, wide trunk, and short limbs of the Jinniushan female is to be expected, as the hominins from that time relied more on their physical body as a cold adaptation, as their technological culture was not yet as advanced as later hominins.

Description
The fossil elements at Jinniushan all belong to one female individual. The fossil remains consist of one cranium, six vertebrae (one cervical, five thoracic), one complete left os coxae, one complete left ulna, one complete left patella, two left ribs, and several hand and feet bones. The Jinniushan specimen's estimated cranial capacity is 1330 cm3. The encephalization quotient (EQ) is estimated to be around 4.150. Both are typical of the rapidly increasing brain capacity and EQ found in other specimens from the Middle Pleistocene.

Comparison
The Jinniushan specimen belongs to an archaic human with mixed Homo erectus and Homo sapiens features.

The Jinniushan specimen is similar to the Dali specimen, but more gracile, which can be explained by sexual dimorphism. The cranial vault and supraorbitals of the Jinniushan specimen are thinner than those of the Dali specimen. Jinniushan's external cranium is the same size as Dali's, but Jinniushan's bones are thinner, so the Jinniushan specimen has a larger brain capacity than the Dali specimen.

Both specimens have flat and broad faces, a feature shared with the specimen from Hulu Cave, Nanjing; both also share some features with the Zhoukoudian and Yunxian specimens.

Morphologically, archaic female and Neanderthal females are more similar to modern females than their male counterparts are to modern males. The similar morphologies imply that the birth mechanics of the Jinniushan hominin is probably similar to that of modern females.

Fauna
Fossils of the extinct macaque Macaca robustus, large beaver Trogontherium, deer Sinomegaceros pachyosteus, rhinoceros Stephanorhinus kirchbergensis, and the vole Microtus brandtioides fossils were found at Jinniushan. Several new species of extinct birds were also discovered, including Aegypius jinniushanensis and Leptoptilos lüi.