They stopped at Kentucky road cuts searching for Ordovician fossils from a time when the area was underwater. At first, the finds looked like ordinary shell fossils scattered through the rock. Then ...

Ammonites swam in the Western Interior Seaway that once covered a large portion of North America. These iridescent fossils from South Dakota, around 69–72 million years old, preserve inner shell ...

A 6-year-old boy in Nebraska made history this summer by discovering a rare fossil at Schramm Park State Recreation Area, the ...

For thousands and sometimes millions of years, marine plankton all over the world built their spiral shells in one direction. Then, suddenly, the spirals switched direction at the same time, ...