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Posted by / 11-Dec-2020 14:14

Cockroach dating fossil history million

"About 65 years ago, several entomologists in the northeastern United States noted that four species of mirrors that of the biogeographic history of the horse.

Horses occurred in the New World and became extinct during the late Pleistocene ecological crisis.

Horses, attached to human habitation, were subsequently introduced to North America by early Spanish explorers about 11,000 years after their demise. This particular species is named after David Kohls, who lives near Rifle, Colorado and has been an indefatigable collector of fossil insects and plants from the nearby Green River Formation.

His collection of approximately 150,000 insects from 31,000 slabs of shale now constitutes the Kohls Green River Fossil Insect Collection, which is housed in the Smithsonian's Department of Paleobiology.

The oldest fossils found are considered to be from the late Archean period which ended 2500 million years ago.

By contrast, the Earth is believed to be 4500 million years old.

The cause for the extinction of in North America in the dim past is unknown, but it evidently survived in the Old World, and western Europe in particular.

However, a shocking new discovery has uprooted that view.

In fact, it now appears that species were recently discovered in the 49-million-year-old Green River Formation near Rifle, Colorado in deposits that are about five million years older than the Baltic amber.

When Easterday compared the fossil cockroach from the 7-11 Mine to cockroaches living in the tropics today, he found them similar.

Though the fossil cockroach is about twice as big as the average American roach, some modern roaches in the tropics are known to grow to four inches or bigger.

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He obtained the cockroach and other fossils in 1999 with the assistance of Gregory Mc Comas, an avid fossil collector and geology graduate of Youngstown State University in Ohio.