Dinwoody Formation

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]

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)

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