アグハ累層 – Wikipedia

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アグハ累層とはアメリカ・テキサス州とメキシコ・コアウイラ州、チワワ州にかけて分布する白亜紀後期の地層。恐竜やアンモナイト等の化石が数多く発見されている[1]。

アグハ累層の年代と主に化石を含んでいる上部頁岩の年代はよくわかっていない。二通りの放射線年代測定が行われたが、7260万前（誤差150万年）と7690万年前（誤差120万年）とで結果が分かれた。[2]
上に堆積しているジャヴェリナ累層との境界は7000万年前と推定されている[3]。しかし正しくは6850万年前である可能性もある[4]。アグハ累層の基底部は8050万年前と推定されている[5]。

無脊椎動物相[編集]

アンモナイト[編集]

脊椎動物相[編集]

クルロタルシ類[編集]

鳥盤類[編集]

獣脚類[編集]

以下の他、詳細不明のオルニトミムス類とティラノサウルス類がテキサスとメキシコに分布する上部層から知られている[5][19]。

  1. ^ Weishampel, David B; et al. (2004). “Dinosaur distribution (Late Cretaceous, North America).” In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 574-588. 0-520-24209-2.
  2. ^ a b c Longrich, N. R.; Sankey, J.; Tanke, D. (2010). “Texacephale langstoni, a new genus of pachycephalosaurid (Dinosauria: Ornithischia) from the upper Campanian Aguja Formation, southern Texas, USA”. Cretaceous Research 31 (2): 274. doi:10.1016/j.cretres.2009.12.002. 
  3. ^ Woodward, H. N. (2005). Bone histology of the sauropod dinosaur Alamosaurus sanjuanensis from the Javelina Formation, Big Bend National Park, Texas.
  4. ^ Sankey, J. (2010). Faunal composition and significance of high–diversity, mixed bonebeds containing Agujaceratops mariscalensis and other dinosaurs, Aguja Formation (Upper Cretaceous), Big Bend, Texas. In New Perspectives on Horned Dinosaurs: The Royal Tyrrell Museum Ceratopsian Symposium (pp. 520-537).
  5. ^ a b Sullivan, R.M., and Lucas, S.G. 2006. “The Kirtlandian land-vertebrate “age” – faunal composition, temporal position and biostratigraphic correlation in the nonmarine Upper Cretaceous of western North America[リンク切れ].” New Mexico Museum of Natural History and Science, Bulletin 35:7-29.
  6. ^ a b c d e f “Aguja Formation (Upper Shale Member), Big Bend Region, Texas,” in Sullivan and Lucas (2006). Page 16.
  7. ^ “The first mandible fragment of Deinosuchus (Eusuchia: Alligatoroidea) discovered in Coahuila, Mexico”. ResearchGate. 2016年3月27日閲覧。
  8. ^ a b c d e “Abstract,” Lucas, Sullivan, and Hunt. (2006).
  9. ^ a b c Wagner and Lehman (2009).
  10. ^ a b c “Dinosaur distribution (Texas and Chihuahua).” Weishampel, et al. (2004). Page 582 and 588.
  11. ^ a b c d e f g h i j k l “Dinosaur distribution (Late Cretaceous; North America; Texas).” Weishampel, et al. (2004). Page 582.
  12. ^ “Table 23.1,” in Weishampel, et al. (2004). Page 496.
  13. ^ a b Listed as ?Chasmosaurus sp. in “Dinosaur distribution (Late Cretaceous; North America; Chihuahua).” Weishampel, et al. (2004). Page 588.
  14. ^ Listed as Edmontonia cf. rugosidens in “Dinosaur distribution (Late Cretaceous; North America; Texas).” Weishampel, et al. (2004). Page 582.
  15. ^ Listed as ?Gryposaurus sp. in “Dinosaur distribution (Late Cretaceous; North America; Texas).” Weishampel, et al. (2004). Page 582.
  16. ^ Prieto-Márquez, A. (2013). “Skeletal morphology of Kritosaurus navajovius (Dinosauria:Hadrosauridae) from the Late Cretaceous of the North American south-west, with an evaluation of the phylogenetic systematics and biogeography of Kritosaurini.” Journal of Systematic Palaeontology, (advance online publication) doi:10.1080/14772019.2013.770417
  17. ^ “Dinosaur distribution (Late Cretaceous; North America; Chihuahua).” Weishampel, et al. (2004). Page 588.
  18. ^ a b c “Abstract,” Longrich, Sankey, and Tanke (2010).
  19. ^ a b c d Mortimer, M (2004年). “Tyrannosauroidea”. The Theropod Database. 2007年8月21日閲覧。
  20. ^ a b Listed as cf. Dromaeosaurus sp. in “Dinosaur distribution (Late Cretaceous; North America; Texas).” Weishampel, et al. (2004). Page 582.
  21. ^ Longrich, N. R.; Barnes, K.; Clark, S.; Millar, L. (2013). “Caenagnathidae from the Upper Campanian Aguja Formation of West Texas, and a Revision of the Caenagnathinae”. Bulletin of the Peabody Museum of Natural History 54: 23. doi:10.3374/014.054.0102. edit
  22. ^ a b c d “Dinosaur distribution (Late Cretaceous; North America; Texas).” Weishampel, et al. (2004). Page 581.
  23. ^ Listed as R. cf. gilmorei in “Dinosaur distribution (Late Cretaceous; North America; Texas).” Weishampel, et al. (2004). Page 581.
  24. ^ Listed as Saurornitholestes cf. langstoni in “Dinosaur distribution (Late Cretaceous; North America; Texas).” Weishampel, et al. (2004). Page 582.
  25. ^ a b Listed as cf. Troodon sp. in “Dinosaur distribution (Late Cretaceous; North America; Texas).” Weishampel, et al. (2004). Page 582.