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.

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

Trilobite (Phacops rana) was designated the state fossil of Pennsylvania in an elementary school science class campaigned for this prehistoric invertebrate.

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.

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.

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

Giant Ammonite Fossils

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

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

Steneosaurus bollensis - Steneosaurus is an extinct genus of teleosaurid crocodyliform from the Early Jurassic to Middle Jurassic (Toarcian to Callovian). Fossil specimens have been found in England, France, Germany, Switzerland and Morocco. The largest species, S. heberti, reached up to 5 m (16.5 ft) long, though 2.5–3.5 m was far more common Species in this genus are traditionally classed into two skull groups: longirostrine (long, narrow jaws) and brevirostrine (short, broad jaws)

Steneosaurus bollensis - Steneosaurus is an extinct genus of teleosaurid crocodyliform from the Early Jurassic to Middle Jurassic (Toarcian to Callovian). Fossil specimens have been found in England, France, Germany, Switzerland and Morocco. The largest s

Dinosaur tail fossil | Archaeopteryx Fossil, most primitive bird known

Archaeopteryx Berlin specimen is considered the most famous fossil in the world. It is about 150 Ma & was discovered in limestone deposits in Eichstaett, Bavaria. Archaeopteryx has bird flight feathers, but also has reptile features such as a tail bone &

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

Fossil Crinoids (Uintacrinus socialis), Smithsonian National Museum of Natural History, Washington, D.C.  Because many crinoids resemble flowers, with their cluster of waving arms atop a long stem, they are sometimes called sea lilies. But crinoids are not plants. Like their relatives—starfishes, sea urchins, sea cucumbers, and brittle stars—crinoids are echinoderms, animals with rough, spiny surfaces and a special kind of radial symmetry based on five or multiples of five.

Fossil Crinoids (Uintacrinus socialis), Smithsonian National Museum of Natural History, Washington, D. gems-minerals-and-fossils

Starfish fossils, this is so cool... from Charmouth on Dorset's Jurassic Coast This starfish fossils cluster is mesmerizing! Credit: tripadvisor  Geology Wonders

Starfish fossils from Charmouth on Dorset's Jurassic Coast Credit: tripadvisor Geology Wonders

Google Image Result for http://www.prehistoricplanet.com/images/features/earth/geologictime/geologictime1.jpg

Rock Layers: Timeline of Life on EarthEvolution is a complicated subject. While everybody understands that black bears are related to grizzly bears and we can even figure they are related to extinct bears, lots of people wonder how scientists can be so su

Megalodon (meaning 'big tooth') is an extinct species of shark that lived about 28 to 1.5 Ma during the Cenozoic era.

Fossil tooth of a megaladon shark

An long Megalodon tooth from the Atacama desert of Chile. A very small number of Megalodon teeth legitimately over 7 inches have been found. This would have correlated to a massive shark about feet in lenght.

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

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