Todays pickGreat Lakes: HOMES โ†’ SHAME

Todays pickGreat Lakes: HOMES โ†’ SHAME

Mnemonic device

Older Deer Play Together Cautiously

Explanation

Represents biological time superimposed over geologic time to mark major extinction events. Specifically, at the end of the Ordovician, Devonian, Permian, Triassic and Cretaceous times. The first letter of each word gives you the first letter of what it stands for.

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