| 词条 | Cason Shale |
| 释义 |
| name = Cason Shale | image = | caption = | type = Formation | age = Ordovician-Silurian | prilithology = Shale | otherlithology = | namedfor = Cason tract and mine, near Batesville, Independence County, Arkansas | namedby = Henry Shaler Williams[1] | region = Arkansas | country = United States | coordinates = | unitof = none | subunits = | underlies = Brassfield Limestone | overlies = Fernvale Limestone | thickness = up to appx. 23 feet[2] | extent = | area = | map = | map_caption = }} The Cason Shale is a Late Ordovician to Middle Silurian geologic formation in the Ozark Plateaus of Arkansas.[2] The name was introduced in 1894 by Henry Shaler Williams in his study of Arkansas.[1] Williams designated a type locality at what was known as the Cason tract and mine, near Batesville, Independence County, Arkansas, however, he did not assign a stratotype. As of 2017, a reference section has not been designated for this unit. See also{{Portal|Paleontology|Ordovician|Silurian}}
References1. ^1 {{cite journal|last1=Williams|first1=Henry S.|title=On the age of the manganese beds of the Batesville region of Arkansas|journal=The American Journal of Science, 3rd series|date=1894|volume=48|pages=325-331|url=https://www.biodiversitylibrary.org/item/124437}} {{US-geologic-formation-stub}}2. ^1 {{cite journal|last1=McFarland|first1=John David|title=Stratigraphic summary of Arkansas|journal=Arkansas Geological Commission Information Circular|date=2004|orig-year=1998|volume=36|page=7|url=http://geology.ar.gov/pdf/IC-36_v.pdf|access-date=2018-01-11|archive-url=https://web.archive.org/web/20161221195953/http://www.geology.ar.gov/pdf/IC-36_v.pdf#|archive-date=2016-12-21|dead-url=yes|df=}} 2 : Ordovician Arkansas|Silurian Arkansas |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。