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Joseph Mike Plavcan Named Chair of the Department of Anthropology
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Expanded geographic distribution and dietary strategies of the earliest Oldowan hominins and Paranthropus
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Understanding the evolution, dispersals, behaviors, and ecologies of early African Homo sapiens requires accurate geochronological placement of fossils and artifacts. We introduce open-air occurrences of such remains in sediments of the Middle Awash study area in Ethiopia. We describe the stratigraphic and depositional contexts of our discoveries and demonstrate the effectiveness of recently developed uranium-series dating of ostrich eggshell at validating and bridging across more traditional radioisotopic methods (14C and 40Ar/39Ar). Homo sapiens fossils and associated Middle Stone Age artifacts are placed at >158 and ∼96 ka. Later Stone Age occurrences are dated to ∼21 to 24 ka and ∼31 to 32 ka, firmly dating the upper portion of one of the longest records of human evolution.
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VIDEO: The USC-led research team used advanced CT scans and comparisons with humans, primates and other fossils to interpret Little Foot s shoulder bones, seen in this video animation. view more
Credit: Kristian Carlson
A long-awaited, high-tech analysis of the upper body of famed fossil Little Foot opens a window to a pivotal period when human ancestors diverged from apes, new USC research shows.
Little Foot s shoulder assembly proved key to interpreting an early branch of the human evolutionary tree. Scientists at the Keck School of Medicine of USC focused on its so-called pectoral girdle, which includes collarbones, shoulder blades and joints.
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