This marl (a fine-grained calcareous mudstone) contains interesting structures.
- Each structure is a cube with hollow faces.
- These cubes are now made of sediment. They are pseudomorphs replacing crystals of a soluble mineral.
- This mineral was halite. What is the chemical composition of halite, and what does its presence tell us about the conditions when this rock was formed?
Scale: is in cm and mm
Grid reference: 914 318