Cedar Mesa Sandstone

Cedar Mesa sandstone (wanda aka fi sani da Cedar Mesa Formation) memba ne na sandstone  na Cutler Formation, wanda aka samo a kudu maso gabashin Utah, kudu maso yammacin Colorado, arewa maso yammacin New Mexico, da arewa maso gabashin Arizona. 

 Bayyanawa 
Dutsen Cedar Mesa Sandstone ya ƙunshi galibin dutsen yashi ja da fari waɗanda ke nuna shimfidar gadon gado irin na dutsen eolian .  An raba gadaje masu kauri na dutsen yashi mai gadaje da siriri na siltstone ko wani dutse mafi laushi wanda ke gushewa cikin sauƙi, yana samar da wuraren zama a kwance.  An gano waɗannan sama da  kuma ya ƙunshi rhizoliths (tushen burbushin halittu) da sauran alamun da ke nuna alamar ƙasa sirara ta samu.  A irin wurinsa a Cedar Mesa kusa da kogin San Juan a Utah, dutsen yashi yana da  zuwa sama da  kauri. Ramin rami kusa da Glen Canyon sun shiga sama da  na Ceder Mesa gadaje.  Zuwa kudu maso gabas, a iyakar bayyanar da ƙasa, dutsen yashi yana haɗuwa tare da gadaje na gypsum, siltstone, da limestone, wanda ke ci gaba da shiga cikin ƙasa na tsawon  .  An sanya dutsen yashi ga Tsarin Cutler, kuma ya wuce Memba na Halgaito sannan kuma Memba na Organ Rock ya lullube shi.  Arewa da arewa maso gabas na haɗuwa da kogin Colorado da Green Rivers, ƙwanƙolin dutsen yashi tare da gadaje na Cutler Formation marasa bambanci. 

An ɗaga Cutler zuwa matsayi na rukuni a wasu yankuna na Colorado Plateau, kuma membobinta, gami da Cedar Mesa Sandstone, ana ɗaga su zuwa matsayi na kafa.

Baya ga rufe Cedar Mesa, Baker, A.A.; Reeside, J.B. Jr. (1929). "Correlation of the Permian of Southern Utah, Northern Arizona, Northwestern New Mexico, and Southwestern Colorado". AAPG Bulletin. 13 (11): 1413–1448. doi:10.1306/3D932893-16B1-11D7-8645000102C1865D.  Cedar Mesa Sandstone ya samar da tsaunuka da canyons da aka samu a cikin gundumomin Needles da Maze na Canyonlands National Park,  da ke cikin White Canyon,  da kuma gadoji uku na halitta na Natural Bridges National Monument.   Sandstone ya ci gaba a cikin ƙasa a cikin yankin Four Corners.

Cedar Mesa Sandstone shine ragowar yashi na bakin teku da aka ajiye kimanin shekaru 270 zuwa 300 da suka gabata, a lokacin Wolfcampian (farkon Permian).  Yanayin ja da fari ya samo asali ne daga ambaliyar ruwa ta lokaci-lokaci wacce ta dauki nauyin ƙarfe mai arziki daga tsaunukan Uncompahgre yayin da aka kafa ta. Gidan gado yana nutsewa akai-akai zuwa kudu maso gabas, yana nuna cewa iskõki masu yawa sun fito ne daga arewa maso yamma, kuma tushen yashi da ke samar da sandstone shine teku mai zurfi zuwa yamma da arewa.

Asalin ƙananan yadudduka na dutse mai laushi ba a daidaita shi ba, Stanesco, J.D.; Campbell, J.A. (1989). "Eolian and Noneolian Facies of the Lower Permian Cedar Mesa Sandstone Member of the Cutler Formation, Southeastern Utah". U.S. Geological Survey Bulletin. 1808-F: F1. doi:10.3133/b1808EF.
Category:CS1: long volume value amma yiwuwar ɗaya shine cewa waɗannan yadudduka sun samo asali a wasu lokuta lokacin da teburin ruwa ya tashi. Wannan ya yanke wadatar yashi, kuma lalacewar iska sannan ya lalata filin dune a matakin teburin ruwa, inda ƙasa mai laushi ta bunkasa kuma ta zama ciyayi.

Gypsum, siltstone, da dutse mai laushi a kudu maso gabas ana fassara su azaman ajiyar Sabkha, an ajiye su a cikin saline bakin teku.

 Abubuwan da aka samo asali 
Ana samun burbushin burbushin halittu a wasu ƙananan yadudduka na dutse mai laushi. Wadannan sun hada da manyan (har zuwa 1 da 8 mita (  da 26 ft 3 in)) katako na conifer, ƙananan raguwa (Equisetum), da ganye masu kama da Asterotheca. Ana zaton an kawo waɗannan cikin filin dune ta hanyar manyan ambaliyar ruwa. Kasusuwa da hakora na dabbobi masu rarrafe, gami da yiwuwar ɓangaren jaw na pelycosaur, an kuma samo su  tsari.

 Tarihin bincike 
Gidajen da ke cikin sashin an sanya su ne a Coconino Sandstone na arewacin Arizona, amma an sake sanya su ga memba na Cedar Mesa sandstone na Cutler Formation ta A.A. Baker da John B. Reeside, Jr., a cikin 1929. Sun ba da sunan memba don fallasawa da ke rufe Cedar Mesa .  SA Wengerd da M.L. Matheny sun ba da shawarar ɗaga Cedar Mesa Sandstone zuwa matsayi na kafa a shekara ta 1958. 

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