Ammonites at the Smithsonian. Originating from within the bactritoid nautiloids, the ammonoid cephalopods first appeared in the Devonian (circa 400 million years ago) and became extinct at the close of the Cretaceous (65.5 Ma) along with the dinosaurs.

Ammonite Fossils - The Promicroceras Planicosta on display at the Smithsonian Museum of Natural History - Washington D.

Seed fern (Neuropteris heterophylla)  Credit: NATURAL HISTORY MUSEUM, LONDON/SCIENCE PHOTO LIBRARY

Seed fern (Neuropteris heterophylla) Credit: NATURAL HISTORY MUSEUM, LONDON/SCIENCE PHOTO LIBRARY

Trilobite fossil. Over 17,000 known species roamed the oceans for over 270 million years. All gone now...

was designated the state fossil of Pennsylvania in Trilobite fossil. Over known species roamed the oceans for over 270 million years.

Over the years the kids have found a lot of fossils. I should find a nice way to display them.

Over the years the kids have found a lot of fossils. - I wish I lived somewhere good for fossils, but a great way to display them is in the old trays used for holding movable type letters!

A Petoskey stone is a rock and a fossil, often pebble-shaped, that is composed of a fossilized coral. Found only in Michigan

A Petoskey stone .is a rock and a fossil, often pebble-shaped, that is composed of a fossilized coral that lived 350 million years ago. The rocks rounded in the surf along the shores of Lake Michigan near Petoskey, Michigan.

Crinoid fossils. Rock containing crinoid (or sea lily) fossils. These are Scyphocrinus elegans crinoids from the Silurian/Devonian period (about 440-360 million years ago). Crinoids are marine echinoderms that appear as early as the Ordovician period (500 million years ago). These crinoids have stalks by which they would attach themselves to the seabed, capturing food with feathery arms that formed a cup (seen at lower right and upper centre). Thousands of extinct crinoid species have been…

Rock containing crinoid (or sea lily) fossils. These are Scyphocrinus elegans crinoids are marine echinoderms.

ammonites (fossils) - loved collecting fossils like these as a child with my dad on family holidays by the sea

ammonites (fossils) - loved collecting fossils like these as a child with my dad on family holidays by the sea Mais

lostbeasts:    Ordovician Trilobites

(examples of variations found among trilobite fossils)Ordovician Trilobites. I wish these guys were still alive, I would have one as a pet.

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