| Marsland Formation | |
|---|---|
| Stratigraphic range: Neogene | |
 | |
| Type | Geological formation |
| Location | |
| Region |  Nebraska |
| Country |  United States |
The Marsland Formation is a geologic formation in Nebraska. It preserves fossils dating back to the Neogene period.
| Marsland Formation | |
|---|---|
| Stratigraphic range: Neogene | |
| | |
| Type | Geological formation |
| Location | |
| Region | Nebraska |
| Country | United States |
The Marsland Formation is a geologic formation in Nebraska. It preserves fossils dating back to the Neogene period.
Color key
| Notes Uncertain or tentative taxa are in small text; |
| Ungulates reported from the Marsland Formation | |||||
|---|---|---|---|---|---|
| Genus | Species | Presence | Material | Notes | Images |
| Mediochoerus | M. johnsoni | Dawes County, Nebraska (upper part of the formation). [1] | A skull [1] | A merycoidodontid. | |
| Menoceras | M. barbouri | Morrill & Box Butte counties, Nebraska. [2] [3] | Skulls. [2] [3] | A rhinoceros. |  |
| M. falkenbachi | Morrill County, Nebraska (lower part of the formation). [2] | Skulls. [2] | Synonymized with M. barbouri. [4] |  | |
| M. marslandensis | Box Butte County, Nebraska (upper part of the formation). [3] | Skulls. [3] | Synonymized with M. barbouri. [4] |  | |
| Testudines reported from the Marsland Formation | |||||
|---|---|---|---|---|---|
| Genus | Species | Presence | Material | Notes | Images |
| Macroclemys | M. schmidti | Box Butte County, Nebraska. [5] | A fragmentary juvenile skull & an adult skull. [5] | A snapping turtle. | |
Daeodon is an extinct genus of entelodont even-toed ungulates that inhabited North America about 23 to 20 million years ago during the latest Oligocene and earliest Miocene. The type species is Daeodon shoshonensis, described by a very questionable holotype by Cope. Some authors synonimize it with Dinohyus hollandi and several other species, but due to the lack of diagnostic material, this is questionable at best.
The John Day Formation is a series of rock strata exposed in the Picture Gorge district of the John Day River basin and elsewhere in north-central Oregon in the United States. The Picture Gorge exposure lies east of the Blue Mountain uplift, which cuts southwest–northeast through the Horse Heaven mining district northeast of Madras. Aside from the Picture Gorge district, which defines the type, the formation is visible on the surface in two other areas: another exposure is in the Warm Springs district west of the uplift, between it and the Cascade Range, and the third is along the south side of the Ochoco Mountains. All three exposures, consisting mainly of tuffaceous sediments and pyroclastic rock rich in silica, lie unconformably between the older rocks of the Clarno Formation below and Columbia River basalts above.
Tomarctus is a canid genus of the extinct subfamily Borophaginae which inhabited most of North America during the late Early Miocene to the Early Barstovian age of the Middle Miocene. Tomarctus existed for approximately 6.83 million years.
Osbornodon iamonensis is an extinct species of hesperocyonine, a predecessor of modern dogs that were endemic to North America and which lived from the Oligocene to Early Miocene epoch 23.6—16.3 Ma and existed for approximately 8 million years. It was named for Lake Iamonia in northern Florida. Fossils have been found in Florida and Nebraska. In the Thomas Farm Site in Gilchrist County, Florida, it is the most common carnivore found in that area.
Aphelops is an extinct genus of hornless rhinoceros endemic to North America. It lived from the Middle Miocene to the early Pliocene, during which it was a common component of North American mammalian faunas along with Teleoceras.
Paleontology in Nebraska refers to paleontological research occurring within or conducted by people from the U.S. state of Nebraska. Nebraska is world-famous as a source of fossils. During the early Paleozoic, Nebraska was covered by a shallow sea that was probably home to creatures like brachiopods, corals, and trilobites. During the Carboniferous, a swampy system of river deltas expanded westward across the state. During the Permian period, the state continued to be mostly dry land. The Triassic and Jurassic are missing from the local rock record, but evidence suggests that during the Cretaceous the state was covered by the Western Interior Seaway, where ammonites, fish, sea turtles, and plesiosaurs swam. The coasts of this sea were home to flowers and dinosaurs. During the early Cenozoic, the sea withdrew and the state was home to mammals like camels and rhinoceros. Ice Age Nebraska was subject to glacial activity and home to creatures like the giant bear Arctodus, horses, mammoths, mastodon, shovel-tusked proboscideans, and Saber-toothed cats. Local Native Americans devised mythical explanations for fossils like attributing them to water monsters killed by their enemies, the thunderbirds. After formally trained scientists began investigating local fossils, major finds like the Agate Springs mammal bone beds occurred. The Pleistocene mammoths Mammuthus primigenius, Mammuthus columbi, and Mammuthus imperator are the Nebraska state fossils.
Ochotona spanglei is an extinct species of pika, known from Late Miocene - Early Pliocene fossil from Oregon (USA). Fossils were also found in Nebraska referred to as Ochotona cf. spanglei.
The Norway Point Formation is a geologic formation in Michigan. It preserves fossils dating back to the middle Devonian period.
The Thunder Bay Limestone is a geologic formation in Michigan. It preserves fossils dating back to the Devonian period.
The Belgrade Formation is a limestone geologic formation in North Carolina characterized by limestone coquina mixed with sand, and thinly laminated clays. It preserves fossils dating back to the Paleogene period.
The Alum Bluff Group is a geologic group in the states of Georgia, Florida, and Alabama. It preserves fossils dating back to the Neogene 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. Ashfall Fossil Beds State Historical Park is within this formation.
The Valentine Formation is a geologic unit formation or member within the Ogallala unit in northcentral Nebraska near the South Dakota border. It preserves fossils dating to the Neogene period and is particularly noted for Canid fossils. A particular feature of the Valentine is lenticular beds of green-gray opaline sandstone that can be identified in other states, including South Dakota, Nebraska, Kansas, and Colorado. Even though three mammalian fauna stages can be mapped throughout the range of the Ogallala, no beddings of the Ogallala are mappable and all attempts of formally applying the Valentine to any mappable lithology beyond the type location have been abandoned. Even so, opaline sandstone has been used to refer to the green-gray opalized conglomerate sandstone that is a particular feature of the lower Ogallala.
The Thin Elk Formation is a geologic formation in South Dakota. It preserves fossils dating back to the Neogene 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.
The Long Pine Formation is a geologic formation in Nebraska. It preserves fossils.
The Astoria Formation is a geologic formation in Washington state & Oregon. It preserves fossils dating back to the early to middle Miocene.
The Ringold Formation is a geologic formation in Eastern Washington, United States. The formation consists of sediment laid down by the Columbia River following the flood basalt eruptions of the Columbia River Basalt Group, and reaches up to 1,000 feet (300 m) thick in places. It preserves fossils dating back to the Neogene period.
The Dove Spring Formation is a geologic formation in the western Mojave Desert of California. It preserves fossils dating back to the Miocene epoch of the Neogene period.
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