Kleffner is a paleontologist and stratigrapher whose research has focused on Silurian rocks and conodonts from the North American midcontinent, according to a news release from Ohio State.

The Resilient Horseshoe Crab (image credits: rawpixel) Horseshoe crabs are often called “living fossils” because they have remained virtually unchanged for over 445 million years, since the Ordovician ...

Fossil found in South Africa named Keurbos susanae after 25 yearsExceptionally preserved soft tissue from post-extinction seafloorHarsh, anoxic condi ...

Long before dinosaurs ruled the land, sharks were already patrolling Earth’s oceans. The earliest shark-like fish appeared during the Ordovician period over 450 million years ago, and by the time ...

About 35 miles southwest of Chicago, Joliet is at the epicenter of a regional water crisis where many suburbs will run out of water supplied by the Cambrian-Ordovician aquifer by 2030, according ...

To explore the macroevolutionary potential of trilobites, the researchers compiled an extensive dataset of body size for Cambrian and Ordovician forms, covering 1,091 genera and representing more ...