| 词条 | Cedar Valley Formation |
| 释义 |
| name = Cedar Valley Formation | image = | caption = | type = Formation | age = Devonian | prilithology = | otherlithology = | namedfor = | namedby = | region = Iowa | country = United States | coordinates = | unitof = | subunits = | underlies = Lime Creek Formation | overlies = | thickness = | extent = | area = | map = | map_caption = }} The Cedar Valley Formation is a geologic formation in Iowa. It preserves fossils dating back to the Devonian period. No type locality has ever been designated for this formation, but it is best known for limestone and dolomite exposures in and around Johnson County, Iowa. The formation is exposed in numerous road cuts, quarries and valley walls over much of north-east and north-central Iowa.[1][2] See also{{Portal|Earth sciences|Iowa|Paleontology|Devonian|Paleozoic}}
References1. ^Bill J. Bunker, Brian J. Witzke and Jed Day, Upper Cedar Valley Stratigraphy North Central Iowa Lithograph City Formation, [https://web.archive.org/web/20120226140907/http://www.iowageology.org/pdf/GB44.pdf Guidebook 44], Geological Society of Iowa, Apr. 27, 1986. {{Iowa-geologic-formation-stub}}{{Devonian-stub}}2. ^{{cite web|title= Fossilworks: Gateway to the Paleobiology Database|author= Various Contributors to the Paleobiology Database|url= http://www.fossilworks.org/|accessdate= 8 July 2014|deadurl= yes|archiveurl= https://web.archive.org/web/20140731140924/http://fossilworks.org/|archivedate= 31 July 2014|df= }} 2 : Devonian Iowa|Devonian southern paleotemperate deposits |
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