Hawks Crag Breccia is a mixture of angular fragments of greywacke in a muddy matrix. Such sediments are typical of alluvial fans, and the Hawks Crag Breccia is thought to be part of an alluvial fan deposited from nearby mountains.
Fossil pollen indicates that the Hawks Crag Breccia is of middle Cretaceous age (95–100 million years old). It may be evidence for mountain building caused by movements in the earth’s crust immediately before the break up of Gondwana.
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Photograph by Simon Nathan
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