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2011 | OriginalPaper | Chapter

9. Proboscidea

Author : William J. Sanders

Published in: Paleontology and Geology of Laetoli: Human Evolution in Context

Publisher: Springer Netherlands

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Abstract

Paleontological fieldwork between 1998–2005 by the Eyasi Plateau Expedition at Laetoli and nearby sites produced a large collection of proboscidean fossils from the early to mid Pliocene Lower and Upper Laetolil Beds and late Pliocene Upper Ndolanya Beds, and possibly older sediments at Endolele, that substantially enlarges the sample of proboscidean material recovered earlier by Louis Leakey in 1935, Kohl-Larsen in 1938–1939, and Mary Leakey in the 1970s and early 1980s. The present study of the combined proboscidean sample confirms the presence of deinotheres and loxodont elephants, and provides the first description of anancine gomphotheres from the area. In addition, the first stegodont from the Eyasi Plateau is identified. The study also suggests that gomphotheres and loxodont elephants evolved locally in the Eyasi Plateau during the early Pliocene. Inference from stratigraphic distribution of proboscidean taxa, isotopic analyses, and dental morphology corresponds with paleoecological reconstruction depicting the Eyasi Plateau during the early-mid Pliocene as covered with abundant shrub- and grassland, with more restricted gallery forest, and as drier during the late Pliocene. Age-grade mortality profiles of elephants and deinotheres from the Laetolil and Upper Ndolanya Beds indicate a chronic lack of standing water or cyclical incidences of drought in the region for a sustained interval of time.

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Title: Proboscidea
Author: William J. Sanders
Publisher: Springer Netherlands
Book: Paleontology and Geology of Laetoli: Human Evolution in Context
Print ISBN: 978-90-481-9961-7

Electronic ISBN: 978-90-481-9962-4

Copyright Year: 2011
DOI: https://doi.org/10.1007/978-90-481-9962-4_9