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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Acknowledgements
I am grateful to Terry Harrison for his invitation to contribute to this volume, for including me in fieldwork at Laetoli and other sites in North-Central Tanzania, and for his generous support of my research on the proboscidean fossil material. Many thanks to the following individuals and institutions for permissions to study fossil specimens in their care: Meave Leakey and Emma Mbua (National Museums of Kenya, Nairobi), Graham and Margaret Avery (Iziko South African Museum, Cape Town), Leonard Ginsburg (Museum National d’Histoire Naturelle, Paris), Mohammed Arif (Geological Survey of Pakistan, Islamabad), Muluneh Mariam (National Museum of Ethiopia, Addis Ababa), Amandus Kweka, Michael Mbago and Paul Msemwa (Tanzanian National Museums, Dar es Salaam), Ezra Musiime (Ugandan Museum, Kampala), Mohammed el-Bedawi (Cairo Geological Museum, Cairo), Noel Boaz (International Institute for Human Evolutionary Research, Ashland, Oregon), and Jerry Hooker (The Natural History Museum, London). I am especially thankful to Bonnie Miljour (University of Michigan, Ann Arbor) for composing the figures and the illustrations, and to many colleagues in Tanzania for their kind hospitality and friendship, especially Amandus Kweka, Michael Mbago, Avelin Malyango, Charles Msuya, and the late Christine Kiyembe. Invaluable help with local logistics and accessing museum collections was provided by Mary Muungu (Kenya National Museums, Nairobi), Amandus Kweka (Tanzanian National Museums, Dar es Salaam), Zelalem Assefa, Samson Tsegaye, and Alemu Admasu (in Addis Ababa and at the National Museum of Ethiopia), and Thalassa Matthews and Kerwin van Willingh (Iziko South African Museum, Cape Town). I am very grateful for constructive comments on the manuscript by Pascal Tassy, Andrew Hill, Terry Harrison, and an anonymous reviewer. This research was generously supported by several Scott Turner Grants from the Department of Geological Sciences, University of Michigan, and through grants to Terry Harrison (New York University, New York, NSF Grant BCS-0309513), John Kappelman (University of Texas, Austin), and Laura MacLatchy (University of Michigan, Ann Arbor).
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Sanders, W.J. (2011). Proboscidea. In: Harrison, T. (eds) Paleontology and Geology of Laetoli: Human Evolution in Context. Vertebrate Paleobiology and Paleoanthropology Series. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-9962-4_9
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