HOME

TheInfoList



Click Here for Items Related To - Wordian
OR:
Wordian on:   [Wikipedia]   [Google]   [Amazon]

In the
geologic timescale The geologic time scale, or geological time scale, (GTS) is a representation of time based on the rock record of Earth. It is a system of chronological dating that uses chronostratigraphy (the process of relating strata to time) and geoch ...
, the Wordian is an age or stage of the
Permian The Permian ( ) is a geologic period and stratigraphic system which spans 47 million years from the end of the Carboniferous Period million years ago (Mya), to the beginning of the Triassic Period 251.9 Mya. It is the last period of the Pale ...
. It is the middle of three subdivisions of the
Guadalupian The Guadalupian is the second and middle series/ epoch of the Permian. The Guadalupian was preceded by the Cisuralian and followed by the Lopingian. It is named after the Guadalupe Mountains of New Mexico and Texas, and dates between 272.95 ...
Epoch In chronology and periodization, an epoch or reference epoch is an instant in time chosen as the origin of a particular calendar era. The "epoch" serves as a reference point from which time is measured. The moment of epoch is usually decided by ...
or Series. The Wordian lasted between and million years ago (Ma). It was preceded by the Roadian and followed by the
Capitanian In the geologic timescale, the Capitanian is an age or stage of the Permian. It is also the uppermost or latest of three subdivisions of the Guadalupian Epoch or Series. The Capitanian lasted between and million years ago. It was preceded ...
.


Stratigraphy

The Wordian Stage was introduced into scientific literature by Johan August Udden in 1916 and was named after the
Word Formation In linguistics, word formation is an ambiguous term that can refer to either: * the processes through which words can change (i.e. morphology), or * the creation of new lexemes in a particular language Morphological A common method of word for ...
of the North American Permian Basin. The Wordian was first used as a stratigraphic subdivision of the Guadalupian in 1961, when both names were still only used regionally in the southern US. The stage was added to the internationally used
ISC #REDIRECT ISC #REDIRECT ISC {{redirect category shell, {{R from other capitalisation{{R from ambiguous page ...
{{redirect category shell, {{R from other capitalisation{{R from ambiguous page ...
timescale in 2001.; 1999: ''Proposal of Guadalupian and Component Roadian, Wordian and Capitanian Stages as International Standards for the Middle Permian Series'', Permophiles 34: pp 3–11. The base of the Wordian Stage is defined as the place in the stratigraphic record where fossils of
conodont Conodonts ( Greek ''kōnos'', " cone", + ''odont'', " tooth") are an extinct group of agnathan (jawless) vertebrates resembling eels, classified in the class Conodonta. For many years, they were known only from their tooth-like oral elements, w ...
species ''
Jinogondolella ''Jinogondolella'' is an extinct genus of conodonts. Mesogondolella and Jinogondolella (Conodonta): Multielement definition of the taxa that bracket the basal Guadalupian (Middle Permian Series) GSSP. Lance L. Lambert, Bruce R. Wardlaw and Charl ...
aserrata'' first appear. The global reference profile for this stratigraphic boundary is located at Getaway Ledge in the
Guadalupe Mountains The Guadalupe Mountains ( es, Sierra de Guadalupe) are a mountain range located in West Texas and southeastern New Mexico. The range includes the highest summit in Texas, Guadalupe Peak, , and the "signature peak" of West Texas, El Capitan, bo ...
of
Texas Texas (, ; Spanish language, Spanish: ''Texas'', ''Tejas'') is a state in the South Central United States, South Central region of the United States. At 268,596 square miles (695,662 km2), and with more than 29.1 million residents in 2 ...
. The top of the Wordian (the base of the Capitanian Stage) is defined as the place in the stratigraphic record where the conodont species ''Jinogondolella postserrata'' first appears. The Wordian stage was part of the time in which the
Zechstein The Zechstein (German either from ''mine stone'' or ''tough stone'') is a unit of sedimentary rock layers of Middle to Late Permian ( Guadalupian to Lopingian) age located in the European Permian Basin which stretches from the east coast of Engl ...
was deposited in Europe.


Biostratigraphy

The Wordian spans the entire conodont
biozone In biostratigraphy, biostratigraphic units or biozones are intervals of geological strata that are defined on the basis of their characteristic fossil taxa, as opposed to a lithostratigraphic unit which is defined by the lithological properties ...
of ''Jinogondolella aserrata''. It contains two
fusulinid The Fusulinida is an extinct order within the Foraminifera in which the tests are traditionally considered to have been composed of microgranular calcite. Like all forams, they were single-celled organisms. In advanced forms the test wall was dif ...
biozones: *Zone of ''Afganella tereshkovae'' *Zone of ''Neoschwagerina tenuis''


Biodiversity

Olson’s Extinction, a worldwide loss of terrestrial vertebrate life occurred during the Early Guadalupian ( Roadian, Wordian).


References


Literature


External links


GeoWhen Database - WordianUpper Paleozoic stratigraphic chart
at the website of the subcommission for stratigraphic information of the ICS {{Geological history, p, p Permian geochronology . Permian geology of Texas