Lithostratigraphic Context for Kln-1993.05-SNJ, a Fossil Colobine Maxilla from Jokotingkir, Sangiran Dome
Source: International Journal of Primatology, Volume 21, Number 4, August 2000 , pp. 731-759(29)
Jablonski and Tyler (1999) announced a new subspecies of colobine monkey based on a fossil partial maxilla from the Sangiran dome. The specimen is easily assigned to a living leaf monkey speciesmost extant Southeast Asian catarrhines differ only subspecifically from their Middle Pleistocene earliest local fossil ancestors. Yet Jablonski and Tyler (1999) reported an improbable provenance for the specimen; a mass-flow volcanic breccia generally considered late Pliocene in age. We show that the Lower Lahar was laid down amidst a range of paludal habitats and that its deposition predates the appearance of all-but-now extinct, water-tolerant mammals on emergent Java. No other catarrhine fossil has been ascribed to the Lower Lahar, not even hominins, which are the most gregarious members of the group. More probable provenance lies in the upper Sangiran or the lower Bapang formations. Either alternative would associate the specimen with other catarrhine fossils in more tenable Pleistocene environments. We also unravel errors and inconsistencies in the contextual report and in the discussion of dome geochronology. The various radiometric, paleomagnetic, and paleontologic studies cited show a discordance of about 300 Ka (thousand years) across the lithostratigraphic sequence. Plio-Pleistocene biogeographic hypotheses for Java must work with short and long chronologies.
Document Type: Regular paper
Affiliations: 1: Department of Anthropology, The University of Iowa, Iowa City, IA 52242 2: Institute of Technology Bandung (ITB), Department of Geology, Jalan Ganesha no. 10, Bandung 40132, Indonesia 3: Geological Research and Development Centre (GRDC), Quaternary Geology Laboratory, Jalan Dr. Junjunan no. 236, Bandung 40174, Indonesia
Publication date: 2000-08-01