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A stratigraphic unit is a volume of rock of identifiable origin and relative age range that is defined by the distinctive and dominant, easily mapped and recognizable petrographic, lithologic or paleontologic features that characterize it. Units must be mappable and distinct from one another, but the contact need not be particularly distinct ...
Lists of fossiliferous stratigraphic units in Europe; Lists of fossiliferous stratigraphic units in North America. Lists of fossiliferous stratigraphic units in Canada; Lists of fossiliferous stratigraphic units in the United States; Lists of fossiliferous stratigraphic units in Oceania; Lists of fossiliferous stratigraphic units in South America
Type locality, also called type area, is the locality where a particular rock type, stratigraphic unit or mineral species is first identified. [1] If the stratigraphic unit in a locality is layered, it is called a stratotype, whereas the standard of reference for unlayered rocks is the type locality. [2] The concept is similar to type site in ...
The basic concept in stratigraphy, called the law of superposition, states: in an undeformed stratigraphic sequence, the oldest strata occur at the base of the sequence. Chemostratigraphy studies the changes in the relative proportions of trace elements and isotopes within and between lithologic units.
Lists of fossiliferous stratigraphic units. Lists of fossiliferous stratigraphic units in Africa; Lists of fossiliferous stratigraphic units in Europe; Lists of fossiliferous stratigraphic units in North America. Lists of fossiliferous stratigraphic units in Canada; Lists of fossiliferous stratigraphic units in the United States; Lists of giants
The Clinton Group (also referred to as the Clinton Formation or the Clinton Shale) is a mapped unit of sedimentary rock found throughout eastern North America. [1] [2] The interval was first defined by the geologist Lardner Vanuxem, who derived the name from the village of Clinton in Oneida County, New York where several well exposed outcrops of these strata can be found.
Units in geochronology and stratigraphy [5] Segments of rock in chronostratigraphy Time spans in geochronology Notes to geochronological units Eonothem: Eon: 4 total, half a billion years or more Erathem: Era: 10 defined, several hundred million years System: Period: 22 defined, tens to ~one hundred million years Series: Epoch
Name Age Location Description Arcabuco Formation [1]: Tithonian to Berriasian: Chíquiza, Boyacá, Colombia; Several tracks of different dinosaur groups Camadas de Alcobaça [2]