Long before the dawn of humans, dinosaurs, insects or even trees, a cascade of unfortunate events threatened to end life on earth. During the Ordovician Period, around 485 to 444 million years ago, ...

A major group of brachiopods are the strophomenids, of which Rafinesquina was one. Characterized by wide flat shells that measure a couple of inches across (large for a brachiopod), millions of ...

It came during the Ordovician period, right after the Cambrian came to a close 485 million years ago. ... like brachiopods, crinoids, ostracodes, cephalopods, corals, and bryozoans.

14. Examine one of the slabs of Ordovician rock from Cincinnati. Are these accumulations of dead organisms, or a catastrophic burial of living organisms.? How many kinds of brachiopods can you ...

What died: Animals that didn’t make it include most trilobite species, many corals and several brachiopods, a hard-shell marine invertebrate often mistaken for a clam today. What thrived: Sea sponges ...

They precisely determined the absolute ages of the Katian–Hirnantian boundary (442.65+0.17/−0.23 Ma) and the Ordovician–Silurian boundary (442.33+0.34/−0.33 Ma), constraining the duration ...

The great increase in biodiversity took place during the geological period known as the Ordovician. - This was a time in Earth history previously believed to be characterized by extreme CO2 levels ...

The "Big Five" mass extinctions of the Phanerozoic Eon have long attracted significant attention from the geoscience community and the public. Among them, the Late Ordovician Mass Extinction (LOME ...