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Purbeck Beds

The Ananova article reads:

**  Bone from 20-tonne dinosaur found in quarry
The fossil has come from rocks known as the Purbeck Beds, in Portland,
Dorset, formed in an arid lagoon about 130 million years ago.

What, exactly, is an "arid lagoon"? This is a contradiction in terms,
no? Can someone more fully describe what the environment that produced
the Purbeck Beds was like?

- DONNA BRAGINETZ