chronostratigraphic unit

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• Geological unit — A geological unit is a volume of rock or ice of identifiable origin and age range that is defined by the distinctive and dominant, easily mapped and recognizable petrographic, lithologic or paleontologic features (facies) that characterize it.… …   Wikipedia

• Eonothem — In stratigraphy and geology, an eonothem is the totality of rock strata laid down in the stratigraphic record deposited during a certain eon of the continuous geologic timescale. The Eonothem is not to be confused with the eon itself, which is a… …   Wikipedia

• Series (stratigraphy) — Series are subdivisions of rock layers made based on the age of the rock. A series is therefore a chronostratigraphic unit, unrelated to lithostratigraphy, which divides rock layers on their lithology. Series are subdivisions of systems and are… …   Wikipedia

• Erathem — In stratigraphy, paleontology, geology, and geobiology an erathem is the total stratigraphic record deposited during a certain corresponding span of time, an era in the geologic timescale. NOTOC It can therefore be used as a chronostratigraphic… …   Wikipedia

• Cenomanian — |The Cenomanian age (also known as Woodbinian [depreciated by the ICS] ) is the first or earliest or oldest Geochronological geologic age of the Late Cretaceous Epoch. Like all geological time units the Cenomanian age is associated with a… …   Wikipedia

• Formation (stratigraphy) — A formation or geological formation is the fundamental unit of lithostratigraphy. A formation consists of a certain number of rock strata that have a comparable lithology, facies or other similar properties. Formations are not defined on the… …   Wikipedia

• Noachian — MOLA colorized relief map of Noachis Terra, the type area for the Noachian System. Note the superficial resemblance to the lunar highlands. Colors indicate elevation, with red highest and blue violet lowest. The blue feature at bottom right is… …   Wikipedia

• Tertiary Period — Interval of geologic time, 65–1. 8 million years ago. It constitutes the first of the two periods of the Cenozoic Era, the second being the Quaternary. The Tertiary has five subdivisions: (from oldest to youngest) the Paleocene, Eocene, Oligocene …   Universalium

• Geochronology — A schematic depiction of the major events in the history of our planet. Geochronology is the science of determining the age of rocks, fossils, and sediments, within a certain degree of uncertainty inherent to the method used. A variety of dating… …   Wikipedia

• Silurian Period — Interval of geologic time, 443–417 million years ago. The third period of the Paleozoic Era, the Silurian follows the Ordovician Period and precedes the Devonian. It marks the first appearance of land plants and jawed fishes. The continents were… …   Universalium

• Geologic time scale — This clock representation shows some of the major units of geological time and definitive events of Earth history. The Hadean eon represents the time before fossil record of life on Earth; its upper boundary is now regarded as 4.0 Ga.[1] Other… …   Wikipedia