Session 6. Deep Sea Facies
There is a particular type of sedimentary facies characterized by thick monotonous sequences of laterally extensive inter-bedded sands & shales. The sands tend to show a characteristic suite of structures as shown in figure 43.
This facies sometimes occurs in non-orogenic zones. Where exposure, or well control, is good enough, it is possible to demonstrate that this facies occurs at the foot of deltas and at the base of fault scarps. The palaeotopography of these instances proves that these are deep marine deposits. The absence of in situ shallow water fossils, cross-bedding and evidence of subaerial exposure confirms a depositional environment below wave base.