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International Commission on Stratigraphy

The International Commission on Stratigraphy, sometimes referred to by the unofficial name International Stratigraphic Commission is a daughter or major subcommittee grade scientific daughter organization that concerns itself with stratigraphical, geological, and geochronological matters on a global scale. It is a subordinate body of the International Union of Geological Sciences - of which it is the largest body within the organisation - and of which it is essentially a permanent working subcommittee that meets far more regularly than the quadrennial meetings scheduled by the IUGS, when i ...



An assise, is a geological term for two or more beds or strata of rock united by the occurrence of the same characteristic species or genera. In the hierarchy of stratigraphic units, an assise lies between a stage and a stratum.


Basement (geology)

In geology, basement and crystalline basement are the rocks below a sedimentary platform or cover, or more generally any rock below sedimentary rocks or sedimentary basins that are metamorphic or igneous in origin. In the same way, the sediments or sedimentary rocks on top of the basement can be called a "cover" or "sedimentary cover".


Bed (geology)

Beds are the layers of sedimentary rocks that are distinctly different from overlying and underlying subsequent beds of different sedimentary rocks. Layers of beds are called strata. They are formed from sedimentary rocks being deposited on the Earths solid surface over a long periods of time. The strata are layered in the same order that they were deposited, permitting discrimination as to which beds are younger and which ones are older. The structure of a bed is determined by its bedding plane. Beds can be differentiated in various ways, including rock or mineral type and particle size. ...


Bernician Series

In geology, Bernician Series was a term proposed by Samuel Pickworth Woodward in 1856 for the lower portion of the Carboniferous System, below the Millstone Grit. The name was suggested by that of the ancient province of Bernicia on the Anglo-Scottish borderland. It is practically equivalent to the "Dinantian" of Albert Auguste de Lapparent and Ernest Munier-Chalmas. In 1875 George Tates "Calcareous and Carbonaceous" groups of the Carboniferous Limestone series of Northumberland were united by George Lebour into a single series, to which he applied the name "Bernician"; but later he spoke ...



A bioevent or bio-event is an event recognised in a sequence of sedimentary rocks, where there is a significant change in the biota as recorded by assemblages of fossils over a relatively short period of time. It has been defined as "short-term locally, regionally, or interregionally pervasive changes in the ecological, biogeographical, and/or evolutionary character of biotas that are isochronous or nearly so throughout their range". Bioevents either relate to diversification of a particular fossil group or a reduction, these may equate to speciation events or extinction events, or may onl ...


ⓘ Stratigraphy

  • volcanic rocks. Stratigraphy has two related subfields: lithostratigraphy lithologic stratigraphy and biostratigraphy biologic stratigraphy Catholic priest
  • The International Commission on Stratigraphy ICS sometimes referred to by the unofficial name International Stratigraphic Commission is a daughter
  • Stratigraphy is a key concept to modern archaeological theory and practice. Modern excavation techniques are based on stratigraphic principles. The concept
  • A system in stratigraphy is a unit of rock layers that were laid down together within the same corresponding geological period. The associated period is
  • Stratigraphy and Geological Correlation is a bimonthly peer - reviewed scientific journal covering fundamental and applied aspects of stratigraphy It was
  • A group in stratigraphy is a lithostratigraphic unit, a part of the geologic record or rock column that consists of defined rock strata. Groups are generally
  • Reverse stratigraphy sometimes known as inverted stratigraphy is the result of a process whereby one sediment is unearthed by human or natural actions
  • Chronostratigraphy Glaciology Magnetostratigraphy Sedimentology Sequence stratigraphy Stratigraphy Mathur S.M. 2008 Elements of Geology. pp. 129 130. ISBN 9788120335158
  • Pennsylvanian and Mississippian series. In 2008, the International Commission on Stratigraphy had not yet named all four series of the Cambrian. Currently series are
  • Sequence stratigraphy is a branch of geology that attempts to subdivide and link sedimentary deposits into unconformity bound units on a variety of scales
  • formally defined layers or strata is central to the geologic discipline of stratigraphy Groups of strata are divided into formations, which are divided into
  • In geology, tectonostratigraphy is stratigraphy that refers either to rock sequences in which large - scale layering is caused by the stacking of thrust
  • The Stratigraphy of the Cambrian period currently has several schemes used for ordering geologic formations from the period. The International Commission
  • as the Wooded Peak Limestone or the Hawks Crag Breccia. New Zealand stratigraphy has also informally been divided into two megasequences The Austral
  • are defined by the International Commission on Stratigraphy ICS by reference to the stratigraphy at particular locations around the world. In 2004
  • biozone or biochronozone According to the International Commission on Stratigraphy the term chronozone refers to the rocks formed during a particular
  • Chronostratigraphy is the branch of stratigraphy that studies the age of rock strata in relation to time. The ultimate aim of chronostratigraphy is to
  • palaeontology and stratigraphy Now published by Wiley - Blackwell, it was originally published by the International Commission on Stratigraphy It is an official
  • Chart Time Scale www. stratigraphy org. International Commission on Stratigraphy International Commission on Stratigraphy Chart Retrieved 10 July
  • In the stratigraphy sub - discipline of geology, a Global Standard Stratigraphic Age, abbreviated GSSA, is a chronological reference point and criterion
  • sciences of geology, archaeology, and other fields dealing with geological stratigraphy It is a form of relative dating. In its plainest form, it states that

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