The Great Slab

 

Great Slab, Bowfell: a fossil lake bed, where volcanic ash has fallen into water. Later earth movements have tilted it by about 30°. During the Ordovician Period life had arrived in the ocean, but not in inland water. The Great Slab has no fossils or worm tracks, showing that it was not sea but freshwater lake – presumably a volcanic caldera lake.

 

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