zone fossil

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• Non-Fossil Fuel Obligation — The Non Fossil Fuel Obligation (NFFO) refers to a collection of orders requiring the electricity Distribution Network Operators in England and Wales to purchase electricity from the nuclear power and renewable energy sectors. Similar mechanisms… …   Wikipedia

• Index fossil — Index fossils (also known as guide fossils or zone fossils) are fossils used to define and identify geologic periods (or faunal stages). They work on the premise that, although different sediments may look different depending on the conditions… …   Wikipedia

• Hybrid zone — A hybrid zone exists where the ranges of two interbreeding species meet. For a hybrid zone to be stable, the offspring produced by the cross (the hybrids) have to be less fit than members of the parent species, although this condition does not… …   Wikipedia

• Acme zone — In biostratigraphy, an acme zone, abundance zone, or peak zone is the the area of a teilzone where a particular fossil taxon reaches a higher level of abundance.cite web |url=http://www.geol.umd.edu/ tholtz/G331/lectures/331strat.htm |title=GEOL… …   Wikipedia

• Lystrosaurus Assemblage Zone — The Lystrosaurus Assemblage Zone is a geological stratum and a faunal zone of the Beaufort Group, of the South African Karoo. The name refers to Lystrosaurus, a genus of mammal like reptile, a dominant life form of the Early Triassic Period,… …   Wikipedia

• Pristerognathus Assemblage Zone — The Pristerognathus Assemblage Zone is a geological stratum and a faunal zone of the Beaufort Group, of the South African Karoo. The name refers to Pristerognathus, a genus of Therocephalian mammal like reptile, whose fossils have been found in… …   Wikipedia

• Tropidostoma Assemblage Zone — The Tropidostoma Assemblage Zone is a geological stratum and a faunal zone of the Beaufort Group, of the South African Karoo. The name refers to Tropidostoma, a genus of dicynodont mammal like reptile, whose fossils have been found in that… …   Wikipedia

• Eodicynodon Assemblage Zone — The Eodicynodon Assemblage Zone is a geological stratum and a faunal zone of the Beaufort Group, of the South African Karoo. The name refers to Eodicynodon, a small herbivore and the earliest genus of dicynodont mammal like reptile, whose fossils …   Wikipedia

• Clonograptus — Graptolites, like this Amplexograptus from the Ordovician near Caney Springs, Tennessee are good zone fossils. A zone fossil must have a short time span but a common animal of the time. Graptolites became extinct at the end of the Devonian.… …   Wikipedia

• Early Jurassic — For general context see Jurassic .The Early Jurassic (in geology referred to as the Lower Jurassic, originally (and still in Europe) the Lias ) is the earliest of three epochs of the Jurassic period. Early Jurassic starts immediately after the… …   Wikipedia

• Caverne de Lovelock — Zone géographique de Lovelock à l est de Reno La caverne de Lovelock est située dans l État du Nevada, à environ 130 kilomètres au nord est de Reno. En 1911, une exploitation de guano y est installée; des mineurs y découvrent des restes… …   Wikipédia en Français