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This article contains a list of fossil-bearing stratigraphic units in the state of Oregon, U.S. Lists of fossiliferous stratigraphic units. Cenozoic. class ...
This article contains a list of fossil-bearing stratigraphic units in the state of Nevada, U.S. Sites. Group or Formation Period Notes Al Rose Formation:
Index fossils must have a short vertical range, wide geographic distribution and rapid evolutionary trends. Another term, "zone fossil", is used when the fossil has all the characters stated above except wide geographical distribution; thus, they correlate the surrounding rock to a biozone rather than a specific time period.
The generic name is derived from a crasis compound word from the Latin parva ancora (small anchor).. The specific name of the type species, P. minchami, honors Mr. H. Mincham, the private collector, who in 1957 had collected and presented a number of fine specimens of Ediacaran fossils to the South Australian Museum.
Fossil of the Middle-Late Ordovician giant trilobite Isotelus. †Isotelus †Jeffersonia †Kanoshia †Kawina †Komaspidella †Komia †Kootenia †Krausella †Lachnostoma †Ladatheca †Lehua †Leonardoceras †Leonaspis †Lingula; Illustration of a fossilized shell of the Cambrian-Late Ordovician brachiopod Lingulella †Lingulella ...
This is a list of stratigraphic units from which dinosaur body fossils have been recovered. Although Dinosauria is a clade which includes modern birds, this article covers only Mesozoic stratigraphic units. Units listed are all either formation rank or higher (e.g. group).
Most of the generic names in this list come from Jack Sepkoski's 2002 compendium of marine fossil genera, which can be corroborated by other sources such as Part L, Ammonoidea, in the Treatise on Invertebrate Paleontology. Additional generic names included come from the Treatise or various peer review scientific journals.
The geologic time scale, proportionally represented as a log-spiral with some major events in Earth's history. A megaannus (Ma) represents one million (10 6) years.. The geologic time scale or geological time scale (GTS) is a representation of time based on the rock record of Earth.