Abstract
Orientation studies of echinoid spines and sponge spicules, coupled with a study of small-scale sedimentary structures, suggest that a principal direction of Lias sedimentation in the Vale of Glamorgan was from the south. The absence of northerly derived Coal Measure or Millstone Grit lithoclasts in the nearshore and offshore Liassic sediments in Glamorgan support this view. The present South Crop of the South Wales Coalfield was presumably not exposed during the Lias.
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