Abstract

Upper Oxfordian and Lower Kimmeridgian shelf sediments contain several environments which can be compared to those in the Gulf of Mexico. The use of coarse fraction analysis, developed by Shepard and Moore (1954), enabled environments to be more precisely discriminated, and the method seems useful even where the sediments are not exactly analogous to those of the Gulf of Mexico. Coarse fraction analysis can be applied to borehole samples where macrofaunal remains and sedimentary structures are rare or difficult to distinguish; and it may also be reasonably successful where microfaunal remains are scarce.

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