Search results
Results from the WOW.Com Content Network
Oil exploration began in earnest in 1916 with an unsuccessful well east of El Dorado, in Union County (which at the time was known as Urbana County). A week after Samuel S. Hunter found modest amounts of oil in the Hunter No. 1 well near Stephens, Arkansas, the Constantin Oil and Refining Company found large amounts of oil and natural gas. Soon ...
The Midcontinent Rift System (MRS) or Keweenawan Rift is a 2,000 km (1,200 mi) 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 , began to split apart during the Mesoproterozoic era of the Precambrian , about 1.1 ...
The rift consists of three major basins and many smaller basins, less than 100 square kilometres (39 sq mi). The three major basins (from northernmost to southernmost) are the San Luis, Española, and Albuquerque basins. The rift's northern extent is delineated by the upper Arkansas River basin between Leadville and Salida, Colorado. Further ...
Pine forest near Lake Winona (Arkansas); part of Ouachita National Forest. Mammoth Spring: 1972: Fulton: State The largest first magnitude spring in Arkansas, it is connected underground to the Grand Gulf State Park in Missouri. Roaring Branch Research Natural Area
Arkansas River: 47,970 1,358: Murray Dam, near Little Rock: White River: 26,760 758: near De Valls Bluff: ... USGS Hydrologic Unit Map – State of Arkansas (1974 ...
Arkansas is ecologically diverse. Though often simplistically split into halves from southwest to northeast, with "uplands" in the northwest half and "lowlands" in the southeastern half, the CEC system of levels reveals the diverse forests and floodplains, prairies and plateaus, ridges and river bottoms, and loess hills and lowlands of Arkansas ...
Accommodation zones may be located where older crustal structures intersect the rift axis. In the Gulf of Suez rift, the Zaafarana accommodation zone is located where a shear zone in the Arabian-Nubian Shield meets the rift. [6] Rift flanks or shoulders are elevated areas around rifts. Rift shoulders are typically about 70 km wide. [7]
Many of the world's largest lakes are located in rift valleys. [2] Lake Baikal in Siberia, a World Heritage Site, [3] lies in an active rift valley. Baikal is both the deepest lake in the world and, with 20% of all of the liquid freshwater on earth, has the greatest volume. [4]