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A tropites fossil is a fossil of a tropites. A tropites is a genus of coiled ammonite. They only existed for about 20 million years, which makes it a good index fossil.
The state of Virginia has a spectacular array of fossils, from 540 million year old burrows to one million year old Mastodon teeth. Most fossils are found in the Piedmont Province and Blue Ridge.
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Precambrian is a geologic period that extends as back as 4.500 million years ago. Fossils are very rare from that period of time.
After being found in fossils, angiosperms were claimed to be 135 million years old
A tropites fossil is a fossil of a tropites. A tropites is a genus of coiled ammonite. They only existed for about 20 million years, which makes it a good index fossil.
The tropites lived 20 million yrs ago.
Fossils from the Silurian Period are between 443.7 and 416 million years old.
Triceratops fossils date to between 68 and 65.5 million years ago. This was during the Maastrichtian stage of the Cretaceous period of the Mesozoic era.
Stegosaurus fossils date from about 155 to 150 million years ago. That was during the Kimmeridgian and Tithonian stages of the Jurassic period. Brachiosaurus fossils date to between 154 and 153 million years ago.
Stegosaurus fossils actually date to between 155 and 150 million years ago. Using various methods, paleontologists are able to determine the age of rocks. Then they know that fossils in those rocks are the same age as the rocks. In the case of Stegosaurus, they know the rocks are between 155 and 150 million years old, and they know the Stegosaurus fossils are the same age.
Primarily during Cambrian, from 600 million years ago.
The youngest known fossils of Apatosaurus date to 150 million years ago. Thus, Apatosaurus probably died out around 150 million years ago.
Apatosaurus fossils date to between 154 and 150 million years ago. That means they existed for about 4 million years.
Velociraptor fossils date to between 75 and 71 million years ago. That means they existed for about 4 million years.
Coal fossils formation begin about 60 million to 290 million years ago (before human existence) therefore no human fossils are found in coal.
Brachiosaurus fossils date to between 154 and 153 million years ago. Thus they existed for around one million years.