Dinwoody Formation

Dinwoody Formation
Stratigraphic range: Induan, ~251.9–250.2  Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Type	Geological formation
Lithology
Primary	Shale, limestone
Location
Region	Idaho, Montana, Utah, Wyoming
Country	United States
Dinwoody Formation (the United States)

The Dinwoody Formation is a geologic formation in the western United States (Idaho, Montana, Utah, Wyoming). It preserves fossils dating back to the Triassic period (Induan stage). ^[1]

Fossil content

Color key Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon		Notes Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

Molluscs

Cephalopods

Cephalopods of the Dinwoody Formation
Genus	Species	Location	Stratigraphic position	Material	Notes	Images
Xiaohenautilus [2]	X. chatelaini				A grypoceratid trigonoceratoid

See also

• Earth sciences portal
• Paleontology portal

• List of fossiliferous stratigraphic units in Montana
• Paleontology in Montana

References

1. Hofmann, Richard; Hautmann, Michael; Bucher, Hugo (2013). "A New paleoecological look at the Dinwoody Formation (Lower Triassic, Western USA): intrinsic versus extrinsic ycontrols on ecosystem recovery after the end-Permian mass extinction" (PDF). Journal of Paleontology. 87 (5): 854–880. Bibcode:2013JPal...87..854H. doi:10.1666/12-153. S2CID   130380562.
2. Jenks, J. F.; Maekawa, T.; Shigeta, Y.; Ware, D.; Brayard, A.; Bylund, K. G.; Stephen, D. A.; Kittrick, N. (2025). "Early Dienerian ammonoids and nautiloids and a new late Griesbachian ammonoid site from the Dinwoody Formation (Thaynes Group) at Crittenden Springs, Elko County, Nevada" (PDF). New Mexico Museum of Natural History and Science Bulletin. 97: 1–29.

• Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database" . Retrieved 17 December 2021.