The Cambrian Bright Angel Shale is the middle layer of the three member Tonto Group geologic feature. The 3-rock Tonto section famously sits upon the Great Unconformity because of the highly resistant cliffs of the base layer, vertical Tapeats Sandstone cliffs.
The Bull Fork Formation is a geologic formation in north central Kentucky and southwestern Ohio. It preserves fossils dating back to the Ordovician period.
The Chouteau Limestone is a geologic formation in Illinois, Iowa, Kansas, and Missouri. It preserves fossils dating back to the Carboniferous period.
The Tongue River Member is a geologic member of the Fort Union Formation in North Dakota and Wyoming. It preserves fossils dating back to the Paleogene period.
The Gaptank Formation is a geologic formation in Texas. It preserves fossils dating back to the Carboniferous period.
The Gunsight Limestone Member is a geologic member in Texas. It preserves fossils.
The Dunderberg Shale is a geologic formation in Nevada and Utah.
The Ely Limestone is a geologic formation in Nevada and Utah. It preserves fossils dating back to the Carboniferous period.
The Campito Formation is a geologic formation in Nevada. It preserves fossils dating back to the Cambrian period.
The Deep Spring Formation is a geologic formation in Nevada. It preserves fossils dating back to the Cambrian period.
The Banner Formation is a Carboniferous period geologic formation in northern Elko County, Nevada.
The Diamond Peak Formation is a geologic formation in Nevada. It preserves fossils dating back to the Carboniferous period.
The McColley Canyon Formation is a geologic formation in Nevada. It preserves fossils dating back to the Devonian period.
The Coils Creek Limestone is a geologic formation in Nevada. It preserves fossils dating back to the Devonian period.
The Aldrich Station Formation is a geologic formation in Nevada. It preserves fossils dating back to the Neogene period.
The Coal Valley Formation is a geologic formation in Nevada. It preserves fossils dating back to the Neogene period.
The Windfall Formation is a geologic formation in northeastern and southern Nevada.
The Johnson Spring Formation is a geologic formation in California. It preserves fossils dating back to the Ordovician period.
The Antelope Valley Limestone is a limestone geologic formation of the Pogonip Group in southern Nevada.
The Nevada Group is an abandoned term for a geologic group in Nevada. The group, reflected a collection of rocks then thought to preserve fossils dating back to the Devonian period.
