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A fossil from the Cherokee Ranch petrified forest. A large petrified forest thought to date to the Paleocene at around 55 million years old is located on and around the grounds of Cherokee Ranch in Douglas County, Colorado. These Denver Basin fossils include plants similar to the modern laurel tree family. At least 40 large petrified logs have ...
Around 1865, commercial fossil collector John Griffiths found some dinosaurian remains, including osteoderms, at the shoreline near Folkestone in Kent, which he sold to the metallurgist Dr. John Percy. Percy brought them to the attention of Thomas Henry Huxley, who paid Griffiths to dig up all fossils he could find at the site. Despite being ...
Keichousaurus is among the most common sauropterygian fossils recovered and are often found as nearly complete, articulated skeletons, making them popular among collectors. Keichousaurus , and the pachypleurosaur family broadly, are sometimes classified within Nothosauroidea , but are otherwise listed as a separate, more primitive lineage ...
The Smoky Hill Chalk Member of the Niobrara Chalk formation is a Cretaceous conservation Lagerstätte, or fossil rich geological formation, known primarily for its exceptionally well-preserved marine reptiles. [2] Named for the Smoky Hill River, [1] the Smoky Hill Chalk Member is the uppermost of the two structural units of the Niobrara Chalk. [2]
Fossil shell of ammonite Placenticeras whitfieldi showing punctures caused by the bite of a mosasaur, Peabody Museum of Natural History, Yale A tooth from a mosasaur Mosasaurs had double-hinged jaws and flexible skulls (much like those of snakes ), which enabled them to gulp down their prey almost whole.
The Painted Hills is a geologic site in Wheeler County, Oregon that is one of the three units of the John Day Fossil Beds National Monument along with Sheep Rock and Clarno. It totals 3,132 acres (12.67 km 2 ) and is located 9 miles (14 km) northwest of Mitchell, Oregon .
A derived, reworked or remanié fossil is a fossil found in rock that accumulated significantly later than when the fossilized animal or plant died. [100] Reworked fossils are created by erosion exhuming (freeing) fossils from the rock formation in which they were originally deposited and their redeposition in a younger sedimentary deposit.
After 1.5 million years ago (extinction of Paranthropus), all fossils shown are human (genus Homo). After 11,500 years ago (11.5 ka, beginning of the Holocene), all fossils shown are Homo sapiens (anatomically modern humans), illustrating recent divergence in the formation of modern human sub-populations.