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Deep Dive: Mass Extinctions Infographic

Earth’s Worst Mass Murderers: Oxygen, Volcanoes… And Humans? Mass-Extinctions Infographic, World Science Festival

Libélula. Www.geologyin.com

The meganeura is an extinct dragonfly, (wingspan greater than 30 inches).

The Ordovician Period: The Rise of The Cephalopods The Rise of The CephalopodsNew animal forms developed, too. The cephalopods became the dominant predators of this period. Cephalopods are a group of mollusks that are related to octopus and squid.The orthoceras was a straight-shelled cephalopod that lived in the largest open end of its shell. Its feet came out of its head! They could rise and fall in the ocean water like a submarine. The siphuncle was a tube in the center of the animal. When…

The Ordovician Period is the second period of the Paleozoic Era. The Ordovician Period began about 490 million years ago and lasted for about 47 million years.

The Paleozoic Era occurred from about 542 million years ago to 251 million years ago. It was a time of great change on Earth.

Paleozoic Era: Facts & Information

The Paleozoic Era occurred from about 542 million years ago to 251 million years ago. It was a time of great change on Earth. Underwater life thrived during the Silurian Period, 443 million years ago to 416 million years ago.

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This 440 Million-Year-Old Fossil Is the Oldest Land Organism Ever Found

Life Before the Dinosaurs: Mixopterus (Eurypterid in the Silurian) am kinda glad they're extinct...

Life Before the Dinosaurs: Mixopterus (Eurypterid in the Silurian) am kinda glad they're extinct.

Diorama at the Museum of Natural History in Washington D.C.

Diorama at the Museum of Natural History in Washington D.

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