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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 ...
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.
Name Age Location Description Abu Agag Formation [1] Egypt [1] Sudan Description Ansbachersandstein [2] Germany [2] Description Argana Formation [3]. Middle Carnian [3] Morocco [3]
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
Lists of fossiliferous stratigraphic units (3 C, 1 P) G. Geological units (4 C, 13 P) I. International Commission on Stratigraphy geologic time scale of Earth (4 C, 2 ...
Name Age Location Description Arcabuco Formation [1]: Tithonian to Berriasian: Chíquiza, Boyacá, Colombia; Several tracks of different dinosaur groups Camadas de Alcobaça [2]
tr 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).
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