The Nemaha Ridge (also called the Nemaha Uplift and the Nemaha Anticline) is located in the Central United States. It is a buried structural zone associated with a

granite Granite () is a coarse-grained (phaneritic) intrusive igneous rock composed mostly of quartz, alkali feldspar, and plagioclase. It forms from magma with a high content of silica and alkali metal oxides that slowly cools and solidifies undergro ...

high in the

Pre-Cambrian The Precambrian (or Pre-Cambrian, sometimes abbreviated pꞒ, or Cryptozoic) is the earliest part of Earth's history, set before the current Phanerozoic Eon. The Precambrian is so named because it preceded the Cambrian, the first period of the ...

basement A basement or cellar is one or more floors of a building that are completely or partly below the ground floor. It generally is used as a utility space for a building, where such items as the furnace, water heater, breaker panel or fuse box, ...

that extends from approximately

Omaha, Nebraska Omaha ( ) is the largest city in the U.S. state of Nebraska and the county seat of Douglas County. Omaha is in the Midwestern United States on the Missouri River, about north of the mouth of the Platte River. The nation's 39th-largest cit ...

Oklahoma City, Oklahoma Oklahoma City (), officially the City of Oklahoma City, and often shortened to OKC, is the capital and largest city of the U.S. state of Oklahoma. The county seat of Oklahoma County, it ranks 20th among United States cities in population, and ...

. The ridge is associated with the seismically active

Humboldt Fault The Humboldt Fault or Humboldt Fault Zone, is a normal fault or series of faults, that extends from Nebraska southwestwardly through most of Kansas.from the Kansas Geological Survey (at the University of Kansassite oil geology page, accessed on Dec ...

zone. It is also associated with the

Proterozoic The Proterozoic () is a geological eon spanning the time interval from 2500 to 538.8million years ago. It is the most recent part of the Precambrian "supereon". It is also the longest eon of the Earth's geologic time scale, and it is subdivided ...

Midcontinent Rift System The Midcontinent Rift System (MRS) or Keweenawan Rift is a long geological rift in the center of the North American continent and south-central part of the North American plate. It formed when the continent's core, the North American craton, be ...

, which extends into northern Kansas about fifty miles west of the Nemaha.Kansas Geological Survey, Current Research in Earth Sciences, Bulletin 250, part 1
"Review of the Nemaha Ridge: A New Look at an Old Structure" Along the Nemaha Ridge is a series of faults referred to as the "Nemaha Fault Zone". The long term uplift along the ridge has been attributed to

isostatic uplift Post-glacial rebound (also called isostatic rebound or crustal rebound) is the rise of land masses after the removal of the huge weight of ice sheets during the last glacial period, which had caused isostatic depression. Post-glacial rebound a ...

due to the anomalously thick crust adjacent to the Midcontinent Rift.Gao, Stephen S., et al., ''Old Rifts Never Die: Crustal Thickening Across the Midcontinent Rift and Its Possible Role in Post-Rifting Tectonics,'' Structure and Tectonics of the Midcontinent, North America, GSA 2002 Denver Annual Meeting
/ref>

References

Landforms of the United States Geology of Kansas Geology of Oklahoma {{Oklahoma-geo-stub