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

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!

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

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.

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

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

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The perfect curve of an ammonite. From seashells to galaxies, the spiral signature of the Goddess is everywhere.

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.

Yes, it's real!! A giant ammonite (http://en.wikipedia.org/wiki/Ammonoidea) fossil.  Giant Ammonite Fossils

Giant Ammonite Fossils

When Trilobites Ruled the World

When Trilobites Ruled the World

designinbiology: “ When Trilobites Ruled the World infographics by The New York Times brought to you by Graphic Services for Science and Graphic Biology ”

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

Sinosauropteryx: The first genus of dinosaur outside of Avialae (birds and their…

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.

Trilobite Fossil Arctinurus boltoni Middle Silurian Rochester Shale Formation Middleport, New York, USA

Trilobite Fossil Arctinurus boltoni Middle Silurian Rochester Shale Formation Middleport, New York, USA

Plesiosaurus hawkinsi: Cast of juveile animal, found in Somerset

Plesiosaurus hawkinsi: Cast of juvenile animal, found in Somerset

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