Английская Википедия:Bone Spring Formation

Материал из Онлайн справочника
Перейти к навигацииПерейти к поиску

Шаблон:Short description Шаблон:Infobox rockunit

The Bone Spring Formation is a geologic formation found in the Delaware Basin in Texas and New Mexico. It preserves fossils dating back to the Leonardian Age of the Permian Period.Шаблон:Sfn

Description

The formation consists of dark gray deep marine limestone interbedded with shale and sandstoneШаблон:Sfn interpreted as turbidites.Шаблон:Sfn The total thickness is about Шаблон:Convert. The base of the formation is largely concealed in the subsurface, and the formation is overlain by the Cutoff Shale.Шаблон:Sfn The formation grades laterally into the Victorio Peak Formation.Шаблон:Sfn

Шаблон:Anchor The uppermost shale beds of the formation have been assigned to the Avalon Shale.Шаблон:Sfn

Fossils

The formation contains fossils of the brachiopods Productus leonardensis, Marginifera cristobalensis, Pugnoides texanus, P. bidentatus, and Composita mexicana; the ammonites Peritrochia erebus, Paracelites elegans, Agathiceras texanum, and Perrinites.Шаблон:Sfn

History of investigation

The formation was first designated the Bone Springs Limestone by Blanchard and Davis in 1929.Шаблон:Sfn It has subsequently been demoted to membership as the Bone Canyon Member of the Leonard Formation,Шаблон:Sfn renamed the Bone Spring Limestone,Шаблон:Sfn and most recently redesigned the Bone Spring Formation.Шаблон:Sfn The Cutoff Shale was removed as a separate formation in 1964.Шаблон:Sfn

Economic geology

The sandstones of the Bone Spring Formation are important petroleum reservoirs with estimated reserves in 1997 of 300,000–375,000 bbl.Шаблон:SfnШаблон:Sfn The formation lies deep in the subsurface in the Delaware Basin, where its shale facies is known as the Avalon Shale.Шаблон:Sfn

See also

Шаблон:Portal

Footnotes

Шаблон:Reflist

References