The earliest fossil evidence for sharks or their ancestors are a few scales dating to 450 million years ago, during the Late Ordovician Period. Emma Bernard, a curator of fossil fish at the Museum, ...

Amateurs, too, can look at local rocks to learn about what life was like in the Ordovician Period, 505 to 438 million years ago. Some of our area's unique geological features and the processes that ...

The oldest echinoids come from the Late Ordovician Period and are approximately 450 million years old. The closest sister group to the echinoids are the holothurians and the two groups must have ...