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Imitoceras sp - Devónico  - Marruecos  - 12 cms.

Imitoceras sp - Devónico - Marruecos - 12 cms.

Sporadoceras münsteri - Devónico - Marruecos - 5 cms.

Sporadoceras münsteri - Devónico - Marruecos - 5 cms.

Rock containing Scyphocrinus elegans crinoids (or sea lily), 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 have stalks by which they would attach themselves to the seabed, capturing food with feathery arms that formed a cup. Thousands of extinct crinoid species have been found as fossils, but only a few hundred sea lily species still exist today.

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

A well-preserved trilobite specimen from Morocco that lived during the Devonian Period roughly 400 million years ago. Credit Chip Clark/Smit...

When Trilobites Ruled the World

THIS IS A FOSSIL! When Trilobites Ruled the World / "A well-preserved trilobite specimen from Morocco that lived during the Devonian Period roughly 400 million years ago.

Los ammonites son parientes extintos de calamares y pulpos. El nautilo es más similar en apariencia a muchos ammonites, aunque es un pariente más lejano. Los ammonites aparecieron hace unos 400 millones de años (a principios del Período Devónico) y experimentaron una súbita y prolífica diversificación evolutiva en el Jurásico temprano.

jpg "The iron reacted with sulfur in the water and these ammonites fossilized into pyrite.

During the Early Devonian seen here 400 million years ago land plants evolved the first true leaves and roots. Fish began to diversify greatly leading this period to be nicknamed "The Age of Fishes". The first ammonites made their appearance during the early Devonian. It was also a relatively warm time during Earth's history with the continent of Gondwanaland still dominating the south. #science #geology #paleontology #fossils #devonian #continentaldrift #tectonic #earth

During the Early Devonian seen here 400 million years ago land plants evolved…

Un cráneo Dunkleosteus, fotografiado en el Museo Royal Tyrrell en Drumheller Alberta.  Dunkleosteus era un pez placoderm que vivió a finales del Devónico, hace 380 hasta 360 millones de años.  Era un depredador hipercarnívoros, alimentándose de presas blindado como ammonites, artrópodos y otros placodermos.  Individuos completamente crecidos tenían más de 700 kilogramos de fuerza de mordida, lo suficiente como para esquilar fácilmente a través de los huesos y los tejidos protectores.

Un cráneo Dunkleosteus, fotografiado en el Museo Royal Tyrrell en Drumheller…

Trilobites del Devónico.

Alpena, MI sits atop a major karst reserve filled with fossils from the Devonian Period (some million years ago).

Imitoceras sp - Devónico  - Marruecos  - 12 cms.

Imitoceras sp - Devónico - Marruecos - 12 cms.

Sporadoceras münsteri - Devónico - Marruecos - 5 cms.

Sporadoceras münsteri - Devónico - Marruecos - 5 cms.

Giant snake fossil, Eocene, 48 million years old - Messel Museum Southern Germany.

Giant snake fossil, Eocene, 48 million years old - Messel Museum Southern Germany.

Crinoids (Uintacrinus socialis), also known as sea lilies or feather-stars, are marine animals from the Cretaceous age, 144 to 65 million years ago. These crinoid fossils are embedded in a limestone matrix.

Uintacrinus socialis, Crinoids, sea lilies or feather-stars, fossils embedded…

Twitter / ayedubz: Crinoid Sea Lily Fossil of ...

Amber Woodin on

Crinoid Sea Lily Fossil, a large prehistoric SEA LILY of the species Scyphocrinus elegans, South Morocco.

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