The Repetto Formation is a Pliocene epoch sedimentary unit in the greater Los Angeles Basin composed primarily of sandstone and conglomerate.
The Golconda Formation is a geologic formation in Kentucky. It preserves fossils dating back to the Carboniferous period. In Indiana, the Golconda, it is called the Golconda Limestone and is part of the Stephensport Group.
The Black River Group is a geologic group that covers three sedimentary basins in the Eastern and Midwestern United States. These include the Appalachian Basin, Illinois Basin and the Michigan Basin. It dates back to the Late Ordovician period. It is roughly equivalent to the Platteville Group in Illinois. In Kentucky and Tennessee it is also known as the High Bridge Group. In areas where this Geologic Unit thins it is also called the Black River Formation (undifferentiated). One example of this is over the Cincinnati Arch and Findley Arch. Large parts of the Black River have been dolomized (where the parent limestone CaCO3 has been turned into dolomite CaMg(CO3)2.) This happed when there was interaction of hot saline brine and the limestone. This created hydrothermal dolomites that in some areas serve as petroleum reservoirs.
The Castle Hayne Limestone is a middle Eocene-aged geologic formation in North Carolina, USA. It consists of cobble to pebble sized clasts, usually rounded, coated with phosphate and glauconite in a limestone matrix. The formation has been dated to the middle Eocene, but its exact age remains uncertain; however, it is generally thought to date to the Lutetian or early Bartonian.
The Cuba Formation is a geologic formation in New York (state) and Pennsylvania. It preserves fossils dating back to the Famennian age.
The Sandy Hook Formation or Red Bank Formation is a geologic formation in New Jersey. It preserves fossils dating back to the Cretaceous period.
The Rancocas Group is a geologic group in New Jersey. It preserves fossils dating back to the latest Cretaceous and the Paleogene period, meaning that it spans the Cretaceous-Paleogene boundary. It contains the Hornerstown Formation and the Vincentown Formation, with some treatments also including the Manasquan Formation within it.
The Monmouth Group or Matawan Group is a major Late Cretaceous-aged geologic group in the eastern United States, known from New Jersey, Pennsylvania, New York, Delaware, and Maryland. It comprises a number of geological formations dating from the Santonian to nearly the end of the Maastrichtian, deposited in nearshore environments off the coast of eastern Appalachia, including deltaic and marine ecosystems. It is highly fossiliferous and preserves a diverse array of fossils, including some of the most prominent dinosaur-bearing deposits of eastern North America.
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 Navarro Group is a geologic group in Arkansas, Texas and Coahuila, Mexico. It preserves fossils dating back to the Cretaceous period.
The Appanoose Formation is a geologic formation in Missouri. It preserves fossils dating back to the Carboniferous period.
The Strawn Formation is a geologic formation in Texas and New Mexico. According to Cummins (1891), the formation was named from the town of Strawn in Palo Pinto County, Texas. It preserves fossils dating back to the Carboniferous period.
The Lueders Formation is a geologic formation in Texas. It is the top formation of the Albany Group and preserves fossils dating back to the Permian period.
The Cutoff Formation is a geologic formation in Texas and New Mexico, US. It preserves fossils dating back to the Permian period.
The Lehman Formation is a geologic formation in Utah. It preserves fossils dating back to the Ordovician period.
The Watahomigi Formation is a geologic formation in the Grand Canyon region of Arizona. It preserves fossils dating back to the Carboniferous period.
The Clallam Formation is a geologic formation in Washington (state). It preserves marine fossils dating back to the late Oligocene and early Miocene period. It outcrops on the northern Olympic Peninsula and along parts of the Strait of Juan de Fuca.
The Makah Formation is a geologic formation in Washington (state). It was deposited during the late Paleogene period between the late Eocene and early Oligocene epoches, and preserves marine fossils dating to the early Oligocene. It outcrops at the northwestern edge of the Olympic Peninsula.
The Puente Formation is a geologic formation in California. It preserves fossils dating back to the middle to upper Miocene epoch of the Neogene period, most of which were deposited in a deepwater environment. Owing to its depositional environment, it is one of the very few geologic formations to preserve articulated specimens of fossilized deep-sea anglerfish.
The Branch Canyon Formation is a geologic formation in California. It preserves fossils dating back to the Neogene period.
