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For the former department store, see Crowley's.

Crowley's Ridge runs through the Mississippi embayment in this shaded-relief map.

Crowley's 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 in a 150-mile (240 km) line from southeastern Missouri to the 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. Most of the major cities of the Arkansas Delta region lie along Crowley's Ridge. The ridge received its name from Benjamin Crowley, the first European settler to reach the area (near present day Paragould, Arkansas) sometime around 1820. The Civil War Battle of Chalk Bluff was fought on Crowley's Ridge in May 1863.


Composition and origin

The ridge is primarily composed of windblown sediment known as loess. The area contrasts greatly with the flat table land around it and with the black alluvial soil that makes up the delta. It varies from half a mile to 12 miles (19 km) wide and reaches an altitude of 550 feet (170 m) near its northern extremity. The formation is generally thought to have originally been an island between the Mississippi River and Ohio River that became a long low hilly ridge after the rivers changed course millions of years ago. Recent research, however, questions the fluvial origin. There is evidence that the area's elevation has increased over the years, suggesting that uplift took place and is still taking place. This alternative explanation posits a link between the ridge and the nearby New Madrid Seismic Zone.[1]

Soils and vegetation

The flora and fauna of the ridge seem more closely related to the Tennessee hills to the east than to the Ozark Mountains to the west. This unique habitat has resulted in the establishment of several state and city parks, a national forest, recreational lakes, and the nation's newest scenic byway, the Crowley's Ridge Parkway.[2][3]

The soils in this area are moderately fertile and sometimes rich. The land is moderately rugged which does not foster row-crop agriculture. These soils are also 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. An example is 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.[4]


This 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. [4]


  1. ^ 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
  2. ^ Crowley's Ridge Parkway National Scenic Byway
  3. ^ Crowley's Ridge Parkway
  4. ^ a b Crowley's Ridge

External links

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



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