Shark teeth through the looking glass. Well drillings can provide a micro snap shop into fossil formations not available on the surface. This well drilling in Richwood, New Jersey punched into the Cretaceous Mount Laural/Navesink Formation more than 100 feet down. The fossils were carefully sifted with window screen from the glauconite-rich "green sand" brought to the surface.

Micro shark teeth from a New Jersey well drilling

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