Abstract
ABSTRACT Clay mineral studies have been undertaken on Pleistocene-Recent and Cretaceous (Maestrichtian) sediments from the outcrop area of seismic reflector Horizon A in the North American Basin. In Quaternary sediments, chlorite is more abundant than kaolinite; in Cretaceous sediments, chlorite is diminished. Development of zeolites, clinoptilolite and phillipsite, along with increase in abundance of montmorillonite indicate that devitrification of ash has been an active diagenetic process in Cretaceous sediments. Changes in kaolinite and chlorite abundances across the disconformable contact between Cretaceous and Quaternary sediments may be due to climatic differences or to a change in sediment source.
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