The Ogallala Formation is a Miocene to early Pliocene geologic formation in the central High Plains of the western United States and the location of the Ogallala Aquifer.[1] In Nebraska and South Dakota it is also classified as the Ogallala Group.[2] Notably, it records the North American Land Mammal Ages (NALMAs) Hemphillian, Clarendonian, and Barstovian.[3] It also includes an excellent record of grass seeds and other plant seeds, which can be used for biostratigraphic dating within the formation. The Ogallala Formation outcrops of Lake Meredith National Recreation Area preserve fish fossils.[4] Similar specimens from the same unit are found at Alibates Flint Quarries National Monument in Texas.[4]
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^"Geologic Unit: Ogallala". National Geologic Database. Geolex — Significant Publications. United States Geological Survey. Retrieved 2020-06-05.
^Cite error: The named reference LudvigsonEtAl was invoked but never defined (see the help page).
^ abCite error: The named reference nps-fish-meredith-67 was invoked but never defined (see the help page).
and 24 Related for: Ogallala Formation information
locality near the town of Ogallala, Nebraska. The aquifer is part of the High Plains Aquifer System, and resides in the OgallalaFormation, which is the principal...
The OgallalaFormation is a Miocene to early Pliocene geologic formation in the central High Plains of the western United States and the location of the...
plain crossed by streams flowing toward the east. During the formation of this [Ogallala] plain in central Kansas the Cretaceous [Niobrara] rocks were...
Trujillo Formation by a disconformity, representing a long hiatus. The coarse, porous sedimentary units of the OgallalaFormation constitute the Ogallala Aquifer...
common on the surface and in river gravels east of the outcrops of the OgallalaFormation. In Australia, silcrete was widely used by Aboriginal people for stone...
Texas Midland, "The Tall City" of West Texas Downtown Odessa The OgallalaFormation is a wedge of sediments built up eastward of the Rocky Mountains as...
in the Big Bend area. A blanket of Miocene sediments known as the Ogallalaformation in the western high plains region is an important aquifer. Located...
The formation is a very fine to fine red aeolian sandstone that rests on the resistant caprock calcrete of the OgallalaFormation. The formation is highly...
in the Big Bend area. A blanket of Miocene sediments known as the Ogallalaformation in the western high plains region is an important aquifer. Texas has...
The Valentine Formation is a geologic unit formation or member within the Ogallala unit in northcentral Nebraska near the South Dakota border. It preserves...
weathering and erosion of the exposed Ogallala, rich in calcium carbonate, contributed heavily to the formation, the resulting material is white (blanco)...
the genus. In 1944, Claude W. Hibbard diagnosed material from the OgallalaFormation of Seward County, Kansas as belonging to the new species P. adamsi...
crossing the Northern High Plains Aquifer system, which includes the Ogallalaformation". In response to a Freedom of Information Act request for route information...
material from the uplift of the Rocky Mountains, which created the OgallalaFormation. All of the rocks in the eastern Kansas valley are sedimentary, ranging...
erupted through the formation favors a shallow, possibly ephemeral, lake. The formation has been likened to the OgallalaFormation of eastern New Mexico...
which the same formation is exposed. Such sites may have separate entries if they are considered to be more notable than the formation as a whole. In...
deposits to the east, further from the original sediment source in the OgallalaFormation at the feet of the Rocky Mountains. Some of the most significant experimental...
deposition of a vast fan of eroded sediment to their east, forming the OgallalaFormation that covers much of the Panhandle. Most of the state's current stream...
the 1970s suggest that the upper level of the cap rock is of the OgallalaFormation from the Pliocene. The Pliocene layers exist further to the north...
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...
known chameleon fossils from India are described from the Miocene Nagri Formation by Sankhyan & Čerňanský (2016). Lee et al. (2016) examine the limb anatomy...
river bed. The flow of the spring came from an outcropping of the OgallalaFormation. Center pivot irrigation adjacent to the spring resulted in lowering...
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