| Ludlow Formation Stratigraphic range: Paleogene | |
|---|---|
 Jarosite concretions from the Ludlow Formation (South Dakota) | |
| Type | Formation |
| Unit of | (partially) Fort Union Formation |
| Underlies | Cannonball Formation and Slope Formation |
| Overlies | Hell Creek Formation |
| Location | |
| Region | North Dakota, South Dakota |
| Country | United States |
The Ludlow Formation is a geologic formation in western North Dakota. [1] It preserves fossils dating back to the Paleogene Period.
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 Java Formation is a geologic formation in Kentucky, New York, Ohio, Pennsylvania, Tennessee, Virginia, West Virginia. It preserves fossils dating back to the Devonian period. The formation comprises the Pipe Creek Shale, Wiscoy Sandstone Member in New York, and Hanover Shale Member except in Tennessee.
The Kinzers Formation is a geologic formation in Pennsylvania. It preserves fossils dating back to the Cambrian Period.
The Franconia Formation is a geologic formation in the upper mid-western United States, with outcroppings found in Illinois, Indiana, Iowa, Michigan, Minnesota, Missouri, Ohio, and Wisconsin. It preserves fossils dating back to the Cambrian period. It was named the Franconia Formation due to the first published documentation of exposures in vicinity of Franconia, Minnesota in the 1897 Ph.D. dissertation by Charles P. Berkley at the University of Minnesota titled Geology of the St. Croix Dalles. The Franconian stratigraphic stage was named after this formation.
The Killdeer Formation is a geologic formation in North Dakota. It preserves fossils dating back to the Neogene.
The Cannonball Formation is a geologic formation in western North Dakota. It preserves fossils dating back to the Paleogene Period.
The Slope Formation is a geologic formation in western North Dakota. It preserves fossils dating back to the Paleogene 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 Harrison Formation is a geologic group in South Dakota and Nebraska. It preserves fossils from the Miocene.
The Minnelusa Formation is a geologic formation in South Dakota. It preserves fossils dating back to the Carboniferous period.
The Ash Hollow Formation of the Ogallala Group is a geological formation found in Nebraska and South Dakota. It preserves fossils dating back to the Neogene period. It was named after Ash Hollow, Nebraska and can be seen in Ash Hollow State Historical Park.
The Batesland Formation is a geologic formation in South Dakota. It preserves fossils dating back to the Neogene period.
The Rosebud Formation is a geologic formation in South Dakota. It preserves fossils dating back to the Neogene period.
The Turtle Butte Formation is a geologic formation at Turtle Butte in South Dakota. It preserves fossils dating back to the Paleogene period.
The Monroe Creek Formation is a geologic formation in South Dakota. It preserves fossils dating back to the Paleogene period.
The Sharps Formation is a geologic formation in South Dakota. It preserves fossils dating back to the Paleogene period.
The White River Formation is a geologic formation of the Paleogene Period, in the northern Great Plains and central Rocky Mountains, within the United States.
The Benton Shale is a geologic formation in Montana, Wyoming, North Dakota, South Dakota, Colorado, Kansas, and Nebraska. It preserves fossils dating to the Cretaceous Period. The term Benton Limestone has also been used to refer to the chalky portions of the strata, especially the upper beds of the strata presently classified as Greenhorn Limestone. The Benton classification is obsolete in some regions, having been replaced by the ascending sequence Graneros Shale, Greenhorn Limestone, and Carlile Shale.
The Three Forks Shale is a geologic formation in Montana and North Dakota. It preserves fossils dating back to the Devonian period.
The Belle Fourche Formation or Belle Fourche Shale is a fossiliferous early Late-Cretaceous geologic formation classification in Wyoming. Named for outcrops in Belle Fourche River, Wyoming, this unit name is also used in Montana, North Dakota, and South Dakota.
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