Crinoid fossils are most commonly found in limestone deposits that were once ancient seabeds. These fossils often consist of ...

Crinoids typically live attached to the bottom of the sea by a long, flexible column and root-like base. The main part of the crinoid body has arms that channel food into the mouth. The hard structure ...

23. What mode(s) of preservation is this (pay attention to the holes!)? What kind(s) of organisms are fossilized here? 24. These are fossils of the same kind of organism, a crinoid. Crinoids are very ...

Crinoid fossils make up the limestone of one of hundreds of rocks collected by Ellen Hartz at her University City ...

The stalk keeps the animal attached to the sea floor and the petal-like tentacles extend out and filter food particles from the water. Multiple cross-sections of crinoid stems, also known as "Indian ...

The skeleton of a prehistoric rodent. Stalactites of an unusual tubular form. An intact crinoid fossil, a seabed animal with feathery arms used for feeding. A tiny hole beckoned at the far end of ...

The small rock her team uncovered was a crinoid stem from the Silurian-Devonian period – a crinoid being a marine organism that attaches to the sea bottom. She was shocked. "I immediately ...

The Sponge was a dish-shaped mass of organic material around these spicules. This fossil is essentially the mud that filled the depression formed by the dead sponge, including the spicules of the ...

On Oct. 24, 1964, the U.S. Army Corps of Engineers dedicated Monroe Reservoir. Sixty years later, it remains Indiana's largest inland reservoir.

Let’s start with a clear definition of what constitutes a mass extinction. Unlike regular extinctions, which occur at a steady background rate — about 10% of species lost every million years — mass ...

A group of hikers started off the month of September by learning about the rocks, fossils, formations and geological history of Clark Reservation State Park. The walk, led by geologist Ashley Prow on ...

On Oct. 24, 1964, the U.S. Army Corps of Engineers dedicated Monroe Reservoir. Sixty years later, it remains Indiana's largest inland reservoir. The lake has two main purposes: flood control and ...