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R114 Proconsul site (Miocene of Kenya)

Also known as Kiakanga Hill; Rusinga

Where: Kenya (0.3° S, 34.1° E: paleocoordinates 1.5° S, 32.0° E)

• coordinate stated in text

• small collection-level geographic resolution

When: Hiwegi Formation (Rusinga Group), Burdigalian (20.4 - 16.0 Ma)

• "Lower Miocene... The [Rusinga] Group itself was probably deposited in less than half a million years, and five Potassium-Argon dates for the Group give a mean age of 17.9 +/- 0.16 Ma (Drake et al., 1988). The Hiwegi Formation and site R114 have not been directly dated."

• group of beds-level stratigraphic resolution

Environment/lithology: "floodplain"; lithified, tuffaceous, green siltstone

• "the infilling of a standing dead, hollow tree trunk. Pyroclastic sediments of the Hiwegi Formation up to several meters in depth were washed around standing trees on the slopes of the ancient volcano of Kisingiri"

•sediments were "reworked by shallow, sluggish streams and redeposited in a floodplain environment" according to Clos 1995

• "The infilling green grits are easily differentiated from the surrounding grey tuffaceous flagstones and agglomerates because they are fenetized. Fenite... is commonly found around carbonate volcanic instrustions"

•"grey tuffaceous siltstone" according to Clos 1995

Size class: macrofossils

Collected by L. S. B. Leakey in 1951, 1984

• "Leakey broke blocks of rock from the pipe and removed those that had bones showing"

Primary reference: J. Arroyo-Cabrales, R. Gregorin, D. A. Schlitter and A. Walker. 2002. The oldest African molossid bat cranium (Chiroptera: Molossidae). Journal of Vertebrate Paleontology 22(2):380-387 [J. Alroy/J. Alroy] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 84800: authorized by John Alroy, entered by John Alroy on 11.11.2008

Creative Commons license: CC BY (attribution)