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Mapping Everywhere Fossils Have Been Found in the U.S.

Explore a world of dead, buried animals with the “United States of Fossiliferousness.”
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Cason Clagg/Jeff Smith

Some people dig for gold. For others, strange creatures that died millions of years ago but live on as funky rock-things are the buried treasure.

Cason Clagg is one such fossil fanatic. Nowadays the software developer is exploring the Haragan Formation in Southern Oklahoma, poking around in limestone for brachiopods and trilobites. It’s a rewarding occupation, if you’re into stuff like that—this is an example of the kind of alien critters he’s unearthing: