Session 5. Shelf Facies
Care must be used in the application of studies of modern marine shelf deposits to interpreting ancient analogues because:-
Absence of vast epeiric seas at the present time;
Effect of eustatic glacial sea level changes
problem of relict fluvioglacial sediments on modern continental shelves,
subaerial cementation & erosion of subaqueous carbonates during glacial maxima. The topography of many modern carbonate barrier islands & reefs is not accretionary but erosional.
Irwin (1964) proposed a depositional model for epeiric seas which is applicable to both terrigenous and carbonate facies (Figure 36).