The intraformational stratigraphy of the Chuos Formation varies significantly for four sections measured in the Karibib/Usakos area. Detailed stratigraphic sections on the iron formations provide evidence for glacial activity during the deposition of the mixtite deposits. Clast counts and the study of matrix type in the mixtite and interbedded clastic sediments provide evidence for a mass flow or reworked glacial origin for the bulk of the mixtite deposit.