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Many fossils of shelly organisms (e.g., bivalves, gastropods, brachiopods, cephalopods) have had the original hard parts dissolved away. In such cases, the fossil itself is an impression of the outside of the shell (external mold) or an impression of the inside of the shell (internal mold).
Fossil collecting (sometimes, in a non-scientific sense, fossil hunting) is the collection of fossils for scientific study, hobby, or profit. Fossil collecting, as practiced by amateurs, is the predecessor of modern paleontology and many still collect fossils and study fossils as amateurs.
Gryphaea, one of the genera known as devil's toenails, is a genus of extinct oysters, marine bivalve mollusks in the family Gryphaeidae.. These fossils range from the Triassic period to the middle Paleogene period [citation needed], but are mostly restricted to the Triassic and Jurassic.
Mold fossil of a shell of the Early Devonian-Late Triassic bivalve Aviculopecten †Aviculopecten †Aviculopecten ballingerana †Aviculopecten girtyi – type locality for species †Aviculopecten gryphus – type locality for species †Aviculopecten herzeri †Aviculopecten occidentalis †Aviculopecten sumnerensis †Aviculopecten texanus ...
The fossil was inconsistent with the typical characteristics of the genus and it was not a valid publication because no Latin name was identified with it. Also, important details of its fruit bodies were not visible or contradicted the identification. Today it is assumed that the fossil belongs to a lichen similar to the genus Chaenotheca.
Index fossils are species of plants or animals that existed over a wide area for a geologically short period of time . [3] The cephalopod Jeletzkytes nodosus is a time-sensitive fossil found in rocks a little younger than 70.6 million years old in the western United States. Other index fossils from Coon Creek date a little older than 70.6 ...
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The abundance of marine fossils from the Alajuela and Gatún Formations, and the Chucunaque Formation, demonstrates seaway connections existed through central Panama during the Late Miocene. Strontium ratios also suggest the Alajuela Formation overlaps in time with the richly fossiliferous Late Miocene Gatún Formation to the north, with which ...