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Early Pleistocene 40 Ar/ 39 Ar ages for Bapang Formation hominins, Central Jawa, Indonesia

Larick, Roy, Ciochon, Russell L., Zaim, Yahdi, Sudijono, Suminto, Rizal, Yan, Aziz, Fachroel, Reagan, Mark, Heizler, Matthew·2001·Proceedings of the National Academy of Sciences
DOI 10.1073/pnas.081077298
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Abstract

The Sangiran dome is the primary stratigraphic window for the Plio-Pleistocene deposits of the Solo basin of Central Jawa. The dome has yielded nearly 80 Homo erectus fossils, around 50 of which have known findspots. With a hornblende 40 Ar/ 39 Ar plateau age of 1.66 ± 0.04 mega-annum (Ma) reportedly associated with two fossils [Swisher, C.C., III, Curtis, G. H., Jacob, T., Getty, A. G., Suprijo, A. & Widiasmoro (1994) Science 263, 1118–1121), the dome offers evidence that early Homo dispersed to East Asia during the earliest Pleistocene. Unfortunately, the hornblende pumice was sampled at Jokotingkir Hill, a central locality with complex lithostratigraphic deformation and dubious specimen provenance. To address the antiquity of Sangiran H. erectus more systematically, we investigate the sedimentary framework and hornblende 40 Ar/ 39 Ar age for volcanic deposits in the southeast quadrant of the dome. In this sector, Bapang (Kabuh) sediments have their largest exposure, least deformation, and most complete tephrostratigraphy. At five locations, we identify a sequence of sedimentary cycles in which H. erectus fossils are associated with epiclastic pumice. From sampled pumice, eight hornblende separates produced 40 Ar/ 39 Ar plateau ages ranging from 1.51 ± 0.08 Ma at the Bapang/Sangiran Formation contact, to 1.02 ± 0.06 Ma, at a point above the hominin-bearing sequence. The chronological sequence of 40 Ar/ 39 Ar ages follows stratigraphic order across the southeast quadrant. An intermediate level yielding four nearly complete crania has an age of about 1.25 Ma.

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Metadata

Authors
Larick, R., Ciochon, R. L., Zaim, Y., Sudijono, Suminto, Rizal, Y., Aziz, F., Reagan, M., & Heizler, M.
Affiliations
URS Corporation, 100 California Street, Suite 500, San Francisco, CA 94111-4529; Department of Anthropology, University of Iowa, Iowa City, IA 52242-1322; Department of Geology, Institute of Technology Bandung, Jalan Ganesha no. 10, Bandung 40132, Indonesia; Quaternary Geology Laboratory, Geological Research and Development Centre, Jalan Dr. Junjunan no. 236, Bandung 40174, Indonesia; Department of Geoscience, University of Iowa, Iowa City, IA 52242-1379; and New Mexico Bureau of Mines and...
Venue
Proceedings of the National Academy of Sciences
Publisher
National Academy of Sciences
Published
2001-04-17
Volume
98
Issue
9
Pages
4866-4871
ISSN
  • 0027-8424
  • 1091-6490
DOI
10.1073/pnas.081077298
Cited by
192
References
0
Language
en

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CoChat. (2026). Citation check: Early Pleistocene 40 Ar/ 39 Ar ages for Bapang Formation hominins, Central Jawa, Indonesia. https://app.cochat.ai/papers/10.1073/pnas.081077298
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Larick, R., Ciochon, R. L., Zaim, Y., Sudijono, Suminto, Rizal, Y., Aziz, F., Reagan, M., & Heizler, M. (2001). Early Pleistocene 40 Ar/ 39 Ar ages for Bapang Formation hominins, Central Jawa, Indonesia. Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.081077298