Fosil ikan, dinosaurus Kapur Akhir, amfibi, dan reptil seperti kura-kura, crocodylomorpha, dan squamata dapat ditemukan di formasi ini. Selain itu, fosil mamalia juga kerap dijumpai, seperti multituberculates, metatheria dan eutheria.
Koleksi fosil Fromasi Hell Creek terbesar di dunia terletak di Museum of the Rockies, yang terletak di Bozeman, Montana, sebagai hasil dari upaya "Hell Creek", yang merupakan upaya gabungan antara pihak museum, Universitas Montana, Universitas Kalifornia, dan Universitas Carolina Utara.
Fosil-fosil crocodilia yang ditemukan pada formasi ini menyatakan bahwa iklim pada lokasi ini dahulunya merupakan iklim subtropis.
Daftar pustaka
Pearson, D.A.; Schaefer, T.; Johnson, K.R.; Nichols, D.J.; Hunter, J.P. (2002). Hartman, John H.; Johnson, Kirk R.; Nichols, Douglas J., ed. Vertebrate Biostratigraphy of the Hell Creek Formation in Southwestern North Dakota and Northwestern South Dakota. Geological Society of America Special Paper 361. The Hell Creek Formation and the Cretaceous-Tertiary boundary in the northern Great Plains: An integrated continental record of the end of the Cretaceous. hlm.145–167. ISBN9780813723617. Diarsipkan dari versi asli tanggal 2023-07-23. Diakses tanggal 2018-09-21.
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Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. 861 pp.ISBN0-520-24209-2.