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Petrography and Origin of Some Upper Jurassic Beds from Dorset, England
Philip R. Brown
Petrographic examination of Lower Purbeck sediments indicates that most of them formed in an evaporitic environment. The dominant sediment was a carbonate-mud, now seen either in the form of pellets and lumps in a fine-coarse crystalline calcite cement, or as a homogeneous calcite-mudstone. Contribution by shells to rock formation is important only at certain horizons, but algae appear to have had considerable influence on sedimentation throughout the Lower Purbeck. Brackish or freshwater environments only attained major importance towards the end of Lower Purbeck time.
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