The Info List - Crowley's Ridge

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Ridge (also Crowleys Ridge) is an unusual geological formation that rises 250 to 550 feet (170 m) above the alluvial plain of the Mississippi embayment
Mississippi embayment
in a 150-mile (240 km) line from southeastern Missouri
to the Mississippi River
Mississippi River
near Helena, Arkansas. It is the most prominent feature in the Mississippi Alluvial Plain between Cape Girardeau, Missouri, and the Gulf of Mexico. This narrow rolling hill region rising above the flat plain is the sixth, and smallest, natural division of the state of Arkansas. It is protected within Ozark–St. Francis National Forest. Most of the major cities of the Arkansas Delta
Arkansas Delta
region lie along Crowley's
Ridge. It was named after Benjamin Crowley, known as the first American settler to reach the area, sometime around 1820. The Civil War Battle of Chalk Bluff
Battle of Chalk Bluff
was fought on Crowley's
Ridge on May 1–2, 1863.


1 Composition and origin 2 Soils and vegetation 3 Fossils 4 Namesake 5 Crowley's
Ridge Nature Center 6 See also 7 References 8 External links

Composition and origin[edit] The ridge is primarily composed of the windblown glacially derived sediment known as loess. It contrasts greatly with the flat table land around it and with the black soil that makes up the delta. The ridge varies from half a mile to 12 miles (19 km) wide and reaches an elevation of 550 feet (170 m) near its northern extremity. The formation is generally thought to have originally been an island between the Mississippi River
Mississippi River
and Ohio River
Ohio River
that was isolated as a long low hilly ridge after the rivers changed course millions of years ago.[1] Recent research, however, questions the fluvial origin.[2] Loess
deposits are found along both sides of the Mississippi River Alluvial Valley. These loess deposits are a classic example of periglacial loess.[3][4] Crowley's
Ridge is a natural loess accumulation point. A comparable example of this type of deposit is the Loess
Hills in northwestern Missouri
and southwestern Iowa. There is evidence that the area's elevation has increased over the years, suggesting that uplift is still taking place. This alternative explanation posits a link between the ridge and the nearby New Madrid Seismic Zone.[2] Soils and vegetation[edit] The flora and fauna of the ridge seem more closely related to the Tennessee
hills to the east than to the Ozark Mountains
Ozark Mountains
to the west. This unique habitat has been protected by the establishment of several state and city parks, the St. Francis National Forest, recreational lakes, and in 1997 a national scenic byway, the Crowley's
Ridge Parkway.[5][6] The soils in this area are moderately fertile and sometimes rich. The land is moderately rugged, discouraging row-crop agriculture. These soils are easily eroded. There is some commercial agriculture in the loessal plains area of the ridge. The ridge is surrounded by the fertile lands of the delta region. The vegetation is predominantly oak and hickory forests, similar to vegetation found in the Appalachian Mountains. Examples are the tulip tree (a yellow poplar) and the American beech. Ferns and flowers abound here, including the American bell flower, crimson catchfly, butterfly weed, cardinal flower, blue lobelia, phlox, verbena, wild hydrangea, hibiscus, aster and yellow jasmine. The low-lying areas around the ridge were once much swampier, and the ridge provided a natural and more healthful place for settlers to establish homes. The ridge became a natural north-south communications link for the region, since travel along the ridge was much easier than through the swampy lowlands.[7] Fossils[edit] The region adjacent to the ridge is covered with thick deltaic soils, and few fossils are found except in gravel pits. These pits sometimes reveal the teeth of large mastodons, mammoths and horses, which roamed the continent as recently as 10,000 years ago. Crowley's
Ridge contains important exposures of fossiliferous Tertiary sediments and contains the only documented Miocene
exposures in the state. A silicified conifer stump weighing several tons was unearthed near Wittsburg, and many more were found around Piggott. Mastodon
bones were found within the city limits of Helena at the southern end of the ridge. Near Forrest City, in the bed of Crow Creek, a deposit of oyster shells estimated to be nearly 7,000,000 cubic yards in size was discovered.[7] Namesake[edit] Crowley's
Ridge is named after Benjamin Crowley
Benjamin Crowley
(1758–1842), the first American settler of the Ridge near Paragould, Arkansas. Crowley is buried in the Shiloh Cemetery in Greene County, Arkansas, and a monument marks the spot. The cemetery is part of Crowley's
Ridge State Park. Next to Crowley's
grave, other early settlers of the ridge are buried in unmarked graves. Crowley's
Ridge Nature Center[edit] The Forrest L. Wood Crowley’s Ridge Nature Center in Jonesboro, Arkansas
features self-guided exhibits about area's topography and natural history and wildlife of Crowley’s Ridge.[8] Operated by the Arkansas
Fish and Game Commission (AGFC) and opened in 2004, the Center includes an exhibit area, discovery room, observation tower, meeting rooms, auditorium, and gift shop.[9] Outside there are trails through trails through wetlands, forest and prairie, and a 1/4 mile universally accessible trail and boardwalk around a pond. The Center offers many activities and nature education programs. It is named after Forrest L. Wood, a former commissioner and supporter of the AGFC. See also[edit]

Ridges of Arkansas U.S. Interior Highlands


^ National Scenic Byways - Scenic Byways and Highways - Arkansas Scenic Routes ^ a b Roy B. Van Arsdale, Robert A. Williams, Eugene S. Schweig, Kaye M. Shedlock, Jack K. Odum and Kenneth W.King, "The origin of Crowley's Ridge, northeastern Arkansas: Erosional remnant or tectonic uplift?" Bulletin of the Seismological Society of America; August 1995; v. 85; no. 4; p. 963-985. Abstract ^ Bettis, E.A., III, D.R. Muhs, H.M. Roberts, and A.G. Wintle, 2003, "Last glacial loess in the conterminous U.S.A.", Quaternary Science Reviews, vol. 22, pp. 1907-1946. ^ Muhs, D.R., and E.A. Bettis, III, 2003, Quaternary loess-paleosol sequences as examples of climate-driven sedimentary extremes. Geological Society of America
Geological Society of America
Paper no. 370, pp. 53-74. ^ Crowley's
Ridge Parkway National Scenic Byway Archived 2004-03-13 at the Wayback Machine. ^ Crowley's
Ridge Parkway ^ a b Crowley's
Ridge Archived March 12, 2003, at the Wayback Machine. ^ " Crowley's
Ridge Natue Center". Arkansas
Fish and Game Commission. Retrieved 6 November 2017.  ^ " Forrest L. Wood Crowley's
Ridge Nature Center". Encyclopedia of Arkansas. Retrieved 6 November 2017. 

External links[edit]

Semo.edu: Crowley's
Ridge USGS
GNIS webpage—U.S. Geological Survey Geographic Names Information System: Crowleys Ridge Arkansas
State Parks: official Crowley's
Ridge State Park website Encyclopedia of Arkansas
history and culture.net: Crowley's
Ridge State Park St. Francis National Forest at Crowley's
Ridge — at southernmost end of ridge, adjacent to Mississippi River.

Wikimedia Commons has media related to Crowley's

Ridge Natue Center

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Coordinates: 36°08′31″N 90°34′30″W / 36.142°N 90.575°W