| Troublesome Formation Stratigraphic range: Neogene | |
|---|---|
| Type | Formation |
| Thickness | 1000 ft or more |
| Location | |
| Region | Colorado |
| Country | United States |
The Troublesome Formation is a geologic formation in Colorado. It preserves fossils dating back to the Neogene period. It consists of Pale shades of pink, tan, gray, green, and white interbedded siltstone and mudstone, less abundant arkosic sandstone and conglomerate, and sparse limestone and altered crystal-vitric ash and tuff; generally poorly consolidated. It includes atypical deposits containing abundant pink, granitic cobbles and boulders along the western parts of the outcrop in the west-central and southwestern parts of the Granby Quadrangle, Fossil mammals from three sites indicate a late Oligocene age (Kron, 1988).
The Fern Glen Formation is a geologic formation in eastern and southeastern Missouri. It preserves fossils dating back to the Osagean Series of the Mississippian subperiod.
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 The Benton classification is obsolete in some regions, having been replaced by the ascending sequence Graneros Shale, Greenhorn Limestone, and Carlile Shale.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 Dotsero Formation is a geologic formation in Colorado. It preserves fossils dating back to the Cambrian period.
The Sawatch Formation is a geologic formation in eastern Colorado. It is a sedimentary sequence formed approximately 530 million years ago during a marine transgression. It preserves fossils dating back to the Cambrian period. It is composed of glauconitic and quartz-rich sandstone.
The Minturn Formation is a geologic formation in Colorado. It preserves fossils dating back to the Carboniferous period. Among the fossils preserved are of crinoids, spiriferid brachiopods, gastropods, and the spines and teeth of numerous sharks such as Petalodus
The Weber Formation is a geologic formation in Colorado. It preserves fossils dating back to the Carboniferous period.
The Dyer Formation is a geologic formation in Colorado. It preserves fossils dating back to the Devonian period.
The Ouray Formation is a geologic formation in Colorado. It preserves fossils dating back to the Devonian period.
The Browns Park Formation is a geologic formation in Colorado. It preserves fossils dating back to the Neogene period.
The Harding Sandstone is a geologic formation in Colorado. It preserves fossils dating back to the Ordovician period.
The Farisita Formation is a geologic formation in Colorado. It preserves fossils dating back to the Paleogene period.
The Huerfano Formation is a geologic formation in Colorado. It preserves fossils dating back to the Paleogene period.
The Middle Park Formation is a geologic formation in Colorado. It preserves fossils dating back to the Paleogene period.
The Shoshone? Formation is a geologic formation in Colorado. It preserves fossils dating back to the Paleogene period.
The Animas Formation is a geologic formation in Colorado. It preserves fossils dating back to the Paleogene period.
The Creede Formation is a geologic formation in Colorado. It preserves fossils dating back to the Paleogene period, particularly many well-preserved fossil plants from Oligocene strata.
The Maroon Formation is a geologic formation in Colorado. It preserves fossils dating back to the Permian period. It is the primary formation of sandstone that lends the vivid red color to the hills around Glenwood Springs, Colorado.
The Alamosa Formation is a geologic formation in Colorado. It preserves fossils. The formation was deposited by Lake Alamosa, a paleolake that existed from the Pliocene to the middle Pleistocene.
The Hermosa Group is a group of geologic formations in Utah and Colorado. It preserves fossils dating back to the Carboniferous period.
The Narrow Cape Formation is a geologic formation in the Kodiak Archipelago, in Alaska. The formation outcrops along Narrow Cape and nearby Ugak Island. It preserves fossils dating back to the Neogene period. Invertebrate fossils are abundant, along with rare vertebrate fossils.
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