西戈約特層

西戈約特層（英文：Barun Goyot Formation、West Goyot Formation）是地層年代屬白堊紀晚期的地層組，位於蒙古國南戈壁省的戈壁沙漠盆地。 西戈約特層早先被稱為是下耐梅蓋特層，位於耐梅蓋特層之下，德加多克塔層（英语：Djadokhta Formation）之上。但也有科學家認為西戈約特層與德加多克塔層屬於相同的岩性單位，兩者之間並無明確的分界。西戈約特層的層型為位於耐梅蓋特地區東側的胡山地區。而在耐梅蓋特地區，僅可見西戈約特化石層的最上層部分。另外，克明察夫地區的紅化石層也被認為屬於西戈約特層。西戈約特層的地層厚度約為110米（360英尺），地層年代約為7,000至7,100萬年前的馬斯垂克期早期，當時主要的環境組成是由岩石風蝕所形成的沙丘。 Gradzinski, R.; & Jerzykiewicz, T. (1974). Sedimentation of the Barun Goyot formation. Palaeontologica Polonica, 30, 111-146. Carpenter, K., Hayashi, S., Kobayashi, Y., Maryańska, T., Barsbold, R., Sato, K., and Obata, I., 2011, "Saichania chulsanensis (Ornithischia, Ankylosauridae) from the Upper Cretaceous of Mongolia", Palaeontographica, Abteilung A, 294(1-3): 1-61 Arbour, V. M.; Currie, P. J.; Badamgarav, D. The ankylosaurid dinosaurs of the Upper Cretaceous Baruungoyot and Nemegt formations of Mongolia. Zoological Journal of the Linnean Society. 2014, 172 (3): 631−652. doi:10.1111/zoj.12185.  Penkalski, P.; Tumanova, T. 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