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.

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.

A BEAUTIFUL SEA LILY FOSSIL, SEIROCRINUS SUBANGULARIS, LOWER JURASSIC, HOLZMADEN, SOUTH GERMANY Estimate 55,000 — 70,000 EUR LOT SOLD. 61,500 EUR

A BEAUTIFUL SEA LILY FOSSIL, SEIROCRINUS SUBANGULARIS, LOWER JURASSIC, HOLZMADEN, SOUTH GERMANY Estimate 55,000 — 70,000 EUR LOT SOLD. 61,500 EUR

Plesiosaurus hawkinsi: Cast of juveile animal, found in Somerset

Plesiosaurus hawkinsi: Cast of juvenile animal, found in Somerset

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!

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

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

Have done fossil hunting (only where it's legal) in Montana, North Dakota and Washington. Fun for all ages.

fossil hunting (only where it's legal) in Montana, North Dakota and Washington. Fun for all ages.

Annularia sp. are the leaf whorls of an extinct horsetail. These horsetails (Sphenopsida) were arborescent (tree-like) and grew to a height of 31 feet. Fossil found in Illinois

- the leaf whorls of an extinct horsetail. These horsetails (Sphenopsida) were arborescent (tree-like) and grew to a height of 31 feet. Fossil found in Illinois

Identified as "Trilobite fossil ... Cambrian" Shape reminds me of a horseshoe crab

Identified as "Trilobite fossil . Cambrian" Shape reminds me of a horseshoe crab

The fossil comes from the Bellevue formation in Ohio. Image via Wiki Commons  This is Streptaster vorticellatus, a member of the Edrioasteroidea class. It lived “only” 450 million years ago, during a period called the Ordovician. The body plan for this class was simple: a main body (theca), composed of many small plates, a peripheral rim for attachment, and (in some species) a pedunculate zone for extension and retraction.

Bellevue Limestone - fossiliferous limestones with Streptaster vorticellatus edrioasteroid (left) and Carneyella ulrichi edrioasteroid (right) (middle Upper Ordovician) from near Maysville, Kentucky, USA.

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.

Pterodactyl fossil. Have you ever really wondered in what way an extinct animal or bird is a proof of evolution? What about those who didn't go extinct and still roam the Earth today essentially unchanged?

Have you ever really wondered in what way is an extinct animal or bird a proof of evolution? What about those who didn& go extinct and still roam the Earth today essentially unchanged?

Sinosauropteryx: The first genus of dinosaur outside of Avialae (birds and their immediate relatives) to be found with evidence of feathers. Which can be seen clearly in this gorgeous fossil.

The living Earth (except a few times when I pin dead stuff) --- Sinosauropteryx: The first genus of dinosaur outside of Avialae (birds and their immediate relatives) to be found with evidence of feathers. Which can be seen clearly in this gorgeous fossil.

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

Kronosaurus fossil.  Can you even imagine what this looked like when it was swimming through the ocean?

Kronosaurus meaning "lizard of Kronos" is an extinct genus of short-necked pliosaur. It was among the largest pliosaurs, and is named after the leader of the Greek Titans, Cronus.

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