Corals.

Corals are Cnidarians, and thus are related to sea anemones, jelly fish, and similar creatures. Corals are like tiny sea anemones with arms and stinging cells used for capturing prey. Corals are colonial or solitary, and both secrete calcium carbonate skeletons of various sizes and shapes that are characteristic of each species.

Coral fossils found around Las Vegas date from the Ordovician period (about 470 million years ago) to the end of the Permian (about 250 mya), when all of these species went extinct. Other species of coral exist today, obviously, but these species all went extinct.

Here, we find colonial and solitary corals. The colonial corals mostly look like groups of rods or pencils, and the solitary corals are horn-shaped.