Author:
Sousa Francis J.,Cox Stephen E.,Hemming Sidney R.,Rasbury E. Troy,Steponaitis Elena,Hatton Kevin,Saslaw Mae,Henkes Gregory,Princehouse Patricia,Vitek Natasha S.,Nengo Isaiah
Abstract
New field observations and 40Ar/39Ar geochronology reveal that the Topernawi Formation of the Ekitale Basin, northern Turkana Depression, Turkana County, Kenya was deposited entirely during the Oligocene between 29.7 ± 0.5 Ma and 29.24 ± 0.08 Ma. These bracketing ages are determined via new 40Ar/39Ar geochronology on a basaltic lava flow at the base of the section and a felsic ignimbrite near the top. A newly discovered basal unit and interbedded lava flow result in a new total sedimentary thickness of 92 m. The Topernawi Formation is the oldest dated syn-rift sedimentary section in the northern Turkana Depression.
Subject
General Earth and Planetary Sciences
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