| 词条 | Yanan Formation |
| 释义 |
| name = Yanan Formation | age = Early-Middle Jurassic ~{{fossilrange|174}} | period = Middle Jurassic | image = | imagesize = | caption = | type = Geological formation | prilithology = Sandstone, siltstone, mudstone, shale | otherlithology = Coal | unitof = Ordos Basin | subunits = Y1, Y2, Y3, Y4, Y5 | underlies = Zhiluo Formation | overlies = Fuxian Formation | thickness = up to {{Convert|220|m|ft|-1}} | area = | map = | map_caption = | location = | coordinates = | region = East Asia | country = {{flag|China}} | extent = Ningxia, Shaanxi | namedfor = | namedby = | year_ts = | location_ts = | coordinates_ts = | paleocoordinates_ts = | region_ts = | country_ts = | thickness_ts = }} The Yanan Formation, alternatively spelled the Yan'an Formation is a geological formation in China. The age of the formation is uncertain, with estimates ranging from Toarcian to Bajocian. It is divided up into 5 members, with the designation of Y1 through Y5. Y2, Y3 and Y4 are predominantly dark shales, while Y1 and Y5 are composed of sandstones, coal beds[1] and interbedded mudstones. The depositional environment at the time was when the Ordos Basin formed a large inland lake, surrounded by floodplains. The dark shales have been explored for the potential of producing shale gas.[2] The coal has also been explored for the production of coalbed methane.[3] The formation is also notable for its fossil content, with dinosaur footprints[4] and the remains of the sauropod Lingwulong[5] having been found in the formation. References1. ^{{Cite journal|last=Ao|first=Weihua|last2=Huang|first2=Wenhui|last3=Weng|first3=Chengmin|last4=Xiao|first4=Xiuling|last5=Liu|first5=Dameng|last6=Tang|first6=Xiuyi|last7=Chen|first7=Ping|last8=Zhao|first8=Zhigen|last9=Wan|first9=Huan|date=January 2012|title=Coal petrology and genesis of Jurassic coal in the Ordos Basin, China|url=http://linkinghub.elsevier.com/retrieve/pii/S1674987111000879|journal=Geoscience Frontiers|volume=3|issue=1|pages=85–95|doi=10.1016/j.gsf.2011.09.004|issn=1674-9871}} {{China-geologic-formation-stub}}2. ^{{Cite journal|last=Wang|first=Dong-dong|last2=Shao|first2=Long-yi|last3=LI|first3=Zhi-xue|last4=LI|first4=Ming-pei|last5=Lv|first5=Dawei|last6=Liu|first6=Haiyan|date=September 2016|title=Hydrocarbon generation characteristics, reserving performance and preservation conditions of continental coal measure shale gas: A case study of Mid-Jurassic shale gas in the Yan'an Formation, Ordos Basin|url=http://linkinghub.elsevier.com/retrieve/pii/S0920410516302492|journal=Journal of Petroleum Science and Engineering|volume=145|pages=609–628|doi=10.1016/j.petrol.2016.06.031|issn=0920-4105}} 3. ^{{Cite journal|last=Xu|first=H.|last2=Tang|first2=D.Z.|last3=Liu|first3=D.M.|last4=Tang|first4=S.H.|last5=Yang|first5=F.|last6=Chen|first6=X.Z.|last7=He|first7=W.|last8=Deng|first8=C.M.|date=June 2012|title=Study on coalbed methane accumulation characteristics and favorable areas in the Binchang area, southwestern Ordos Basin, China|url=http://linkinghub.elsevier.com/retrieve/pii/S0166516212000365|journal=International Journal of Coal Geology|volume=95|pages=1–11|doi=10.1016/j.coal.2012.02.001|issn=0166-5162}} 4. ^{{Cite journal|last=Xing|first=Lida|last2=Lockley|first2=Martin G.|last3=Tang|first3=Yonggang|last4=Klein|first4=Hendrik|last5=Zhang|first5=Jianping|last6=Persons|first6=W. Scott|last7=Dai|first7=Hui|last8=Ye|first8=Yong|date=2015-01-02|title=Theropod and Ornithischian Footprints from the Middle Jurassic Yanan Formation of Zizhou County, Shaanxi, China|journal=Ichnos|volume=22|issue=1|pages=1–11|doi=10.1080/10420940.2014.985670|issn=1042-0940}} 5. ^{{Cite journal|last=Xu|first=Xing|last2=Upchurch|first2=Paul|last3=Mannion|first3=Philip D.|last4=Barrett|first4=Paul M.|last5=Regalado-Fernandez|first5=Omar R.|last6=Mo|first6=Jinyou|last7=Ma|first7=Jinfu|last8=Liu|first8=Hongan|date=2018-07-24|title=A new Middle Jurassic diplodocoid suggests an earlier dispersal and diversification of sauropod dinosaurs|url=http://www.nature.com/articles/s41467-018-05128-1|journal=Nature Communications|volume=9|issue=1|pages=2700|doi=10.1038/s41467-018-05128-1|issn=2041-1723|pmc=6057878|pmid=30042444}} 4 : Geologic formations of China|Natural history of China|Lower Jurassic Series|Jurassic System of Asia |
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