Actinopterygian fishes and other vertebrate fauna from fossiliferous horizons of the Lower Member of the Letovice Formation (Lower Permian) in the Boskovice Graben

2015 ◽  
Author(s):  
Stanislav Štamberg
Keyword(s):  
Lower Permian ◽  
Vertebrate Fauna ◽  
Lower Member ◽  
Actinopterygian Fishes

scholarly journals Olson's Extinction and the latitudinal biodiversity gradient of tetrapods in the Permian

2017 ◽  
Vol 284 (1852) ◽  
pp. 20170231 ◽  
Author(s):  
Neil Brocklehurst ◽  
Michael O. Day ◽  
Bruce S. Rubidge ◽  
Jörg Fröbisch
Keyword(s):  
North America ◽  
Mass Extinction ◽  
Fossil Record ◽  
Middle Permian ◽  
Lower Permian ◽  
Vertebrate Fauna ◽  
Terrestrial Vertebrate ◽  
Substantial Change

The terrestrial vertebrate fauna underwent a substantial change in composition between the lower and middle Permian. The lower Permian fauna was characterized by diverse and abundant amphibians and pelycosaurian-grade synapsids. During the middle Permian, a therapsid-dominated fauna, containing a diverse array of parareptiles and a considerably reduced richness of amphibians, replaced this. However, it is debated whether the transition is a genuine event, accompanied by a mass extinction, or whether it is merely an artefact of the shift in sampling from the palaeoequatorial latitudes to the palaeotemperate latitudes. Here we use an up-to-date biostratigraphy and incorporate recent discoveries to thoroughly review the Permian tetrapod fossil record. We suggest that the faunal transition represents a genuine event; the lower Permian temperate faunas are more similar to lower Permian equatorial faunas than middle Permian temperate faunas. The transition was not consistent across latitudes; the turnover occurred more rapidly in Russia, but was delayed in North America. The argument that the mass extinction is an artefact of a latitudinal biodiversity gradient and a shift in sampling localities is rejected: sampling correction demonstrates an inverse latitudinal biodiversity gradient was prevalent during the Permian, with peak diversity in the temperate latitudes.

scholarly journals Brachiopods from the Río del Peñón Formation. Río Blanco Basin, Upper Palaeozoic of Argentina.

2021 ◽  
Vol 15 (2) ◽  
pp. 129
Author(s):  
Gabriela Adriana Cisterna ◽  
Tristán Simanauskas
Keyword(s):  
Western Australia ◽  
Lower Permian ◽  
Early Permian ◽  
Lower Member ◽  
Brachiopod Fauna ◽  
Middle Member ◽  
La Rioja ◽  
Age Range

This paper reviews the brachiopod fauna from the Ríoo de! Peñón Formation, Río Blanco Basin, Upper Palaeozoic of La Rioja province, Argentina. Traditionally, this unit was referred to the Carboniferous, however the braquiopod fauna here studied suggests a new biostratigraphical interpretation, indicating an age range from the latest Carboniferous to Early Permian. Three different brachiopod assemblages can be identified in the section: Assemblage I, from the lower member, includes Streptorhynchus? sp., Dyschrestia? sp., Costatumulus sp. A, Trigonotreta sp., Spiriferellina sp., Orbiculoidea sp., and unidentifiable productids and strophomenids.Assemblage II, from the middle member, includes Tivertonia jachalensis (Amos), Kochiproductus riojanus (Leanza), Costatumulus sp. B, Trigonotreta riojanensis (Lech and Acefiolaza) and Orbiculoidea sp. Assemblage III, from the highest part of the middle member, includes Neochonetes pegnonensis sp. nov., Costatumulus sp. C, Rhynchopora sp., Septosyringothyris jaguelensis Lech, and Orbiculoidea sp. These brachiopod assemblages demonstrate close affinities with faunas from the lower Permian of Western Australia and India. Affinities with faunas from Peru and Texas are less close. 

Sedimentology and diagenesis of Upper Mississippian to Lower Permian strata, Talbot Lake area, Jasper National Park, Alberta

1989 ◽  
Vol 26 (2) ◽  
pp. 275-295 ◽  
Author(s):  
Kwok-Choi Ng ◽  
Brian Jones
Keyword(s):  
Sea Water ◽  
Upper Permian ◽  
Lower Permian ◽  
Lake Area ◽  
Lower Member ◽  
Head Formation ◽  
Carbonate Sequence ◽  
Upper Intertidal ◽  
Shallow Subtidal ◽  
Carbonate Cementation

In the Talbot Lake area, the Upper Mississippian carbonate sequence comprises, in ascending order, the Turner Valley and Mount Head formations. The Mount Head Formation is informally divided into lower and upper members. The rocks of the Upper Mississippian originated by sedimentation associated with successive shallowing-upward sequences. On the basis of the fossils, lithologies, textural characters, and sedimentary structures, the Turner Valley Formation apparently resulted from sedimentation on open marine shoals and in a lagoon, the lower member of the Mount Head Formation from sedimentation in shallow subtidal to lower supratidal environments, and the upper member of the Mount Head Formation from deposition in upper intertidal to supratidal environments.The paraconformity between the lower and upper members of the Mount Head Formation records a short erosional break. A disconformity between the Upper Mississippian carbonates and the Upper Permian Ishbel Group displays paleotopographic relief and paleokarstic features developed during exposure in post-Mississippian times. The disconformity is overlain by a condensed sequence of Pennsylvanian to Permian strata.Major diagenetic modifications of the Upper Mississippian strata include dolomitization, silica replacement and cementation, carbonate cementation, and dedolomitization. A diagenetic realm comprising sea water, fresh water, and hypersaline brine was probably responsible for some of the complex diagenesis in these rocks.

Lithostratigraphy and microfossil biostratigraphy of the Pennsylvanian-lower Permian Horquilla Formation at New Well Peak, Big Hatchet Mountains, New Mexico, USA

Stratigraphy ◽  
2017 ◽  
Vol 14 (1-4) ◽  
pp. 223-246
Author(s):  
Spencer G. Lucas ◽  
Karl Krainer ◽  
James E. Barrick ◽  
Daniel Vachard ◽  
Scott M. Ritter
Keyword(s):  
New Mexico ◽  
Lower Permian

Shorelines and vertebrate fauna of Pleistocene Lake Bonneville, Utah, Idaho, and Nevada

2017 ◽  
Vol 4 ◽  
pp. 181-214 ◽  
Author(s):  
Mark Milligan ◽  
H. Gregory McDonald
Keyword(s):  
Salt Lake ◽  
Great Salt Lake ◽  
Lake Levels ◽  
Lake Bonneville ◽  
Vertebrate Fauna ◽  
World Class

Pleistocene Lake Bonneville created many classic examples of lacustrine shoreline landforms, which preserve a wide variety of vertebrate fossils. _is _eld guide provides a review of the published literature for a sampling of the lake’s world-class localities. _is guide also provides a brief overview of modern Great Salt Lake and its microbialites recently exposed by near-record low lake levels. Stops include G.K. Gilbert Geologic View Park, Draper spit, Steep Mountain beach, Point of the Mountain spit, American Fork delta, Stockton Bar, and Great Salt Lake State Park.

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