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Fossil Alligator - Alligator prenasalis - This extinct member of the family Alligatoridae is the earliest known member of genus Alligator. It is a well known species from many fossils collected in the Oligocene Epoch - 33.9 ± 0.1 to 23.03 ± 0.05 Ma (million years ago) - layer of the Chadron & Brule Formations in South Dakota

Fossil Alligator - Alligator prenasalis - This extinct member of the family Alligatoridae is the earliest known member of genus Alligator. It is a well known species from many fossils collected in the Oligocene Epoch - 33.9 ± 0.1 to 23.03 ± 0.05 Ma (million years ago) - layer of the Chadron & Brule Formations in South Dakota

Mesosaurus brasiliensis (complete specimen on matrix) - 14.56" (37 cm) x 8.07" (20.5 cm) matrix - Permian Period : 298.9 ± 0.2 Ma - 252.2 ± 0.5 Ma (million years ago) - Irati Formation ( a geological formation of Brazil) - São Paulo, Brazil

Mesosaurus brasiliensis (complete specimen on matrix) - 14.56" (37 cm) x 8.07" (20.5 cm) matrix - Permian Period : 298.9 ± 0.2 Ma - 252.2 ± 0.5 Ma (million years ago) - Irati Formation ( a geological formation of Brazil) - São Paulo, Brazil

Dimetrodon footprint Dimetrodon meaning "two measures of teeth") is an extinct genus of synapsid that lived during the Early Permian period, around 295–272 million years ago (Ma).It is a member of the family Sphenacodontidae. The most prominent feature of Dimetrodon is the large sail on its back formed by elongated spines extending from the vertebrae. It walked on four legs and had a tall, curved skull with large teeth of different sizes set along the jaws

Dimetrodon footprint Dimetrodon meaning "two measures of teeth") is an extinct genus of synapsid that lived during the Early Permian period, around 295–272 million years ago (Ma).It is a member of the family Sphenacodontidae. The most prominent feature of Dimetrodon is the large sail on its back formed by elongated spines extending from the vertebrae. It walked on four legs and had a tall, curved skull with large teeth of different sizes set along the jaws

The Texas Panhandle once was home to a slew of creatures, big and small, ranging from horse-like mammals and saber-toothed cats to the phytosaur — a giant, crocodile-like reptile that slithered in the swamps. The Panhandle-Plains Historical Museum in Canyon has several fossil exhibits, including this phytosaur, a crocodile-like reptile that lived here millions of years ago [Credit: Amarillo]

The Texas Panhandle once was home to a slew of creatures, big and small, ranging from horse-like mammals and saber-toothed cats to the phytosaur — a giant, crocodile-like reptile that slithered in the swamps. The Panhandle-Plains Historical Museum in Canyon has several fossil exhibits, including this phytosaur, a crocodile-like reptile that lived here millions of years ago [Credit: Amarillo]

Solving the mystery of the spiral shaped teeth preserved in the fossil record.  The "buzz saw shark".

Solving the mystery of the spiral shaped teeth preserved in the fossil record. The "buzz saw shark".

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