Unit M27

image M27-04

cross beds

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Here, cross-bedded sandstones are exposed in three dimensions. Each foreset (inclined layer) represents the front (lee side) of the migrating dune on the river bed at a particular point in time.

  • Which way was the current flowing?
  • What was the minimum height of the dune?
  • What shape was the dune in three dimensions: was the crest curved or straight?

Scale: The geologist is 1.7 m tall

Grid reference: 996 324

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