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The geology of Arkansas includes deep 1.4 billion year old igneous crystalline basement rock from the Proterozoic known only from boreholes, overlain by extensive sedimentary rocks and some volcanic rocks. The region was a shallow marine, riverine and coastal environment for much of the early Paleozoic as multi-cellular life became commonplace.
Lake Tacoma was at the southern end of the Vashon Glacier in Puget Sound covering Commencement Bay, extending south up the Puyallup River valley. Washington basin east of Seattle. Glacial Lake Snoqualmie in Washington State; Columbia River basin: Lake Allison; 15,000 – 13,000 YBP in the Willamette Valley of Oregon. [30]
Location of Arkansas in the United States. Arkansas is located in the southeastern United States, in the West South Central Census Bureau division. Arkansas covers an area of 53,179 square miles (137,733 km²) and ranks as the 29th largest state by size. [7]
The Ouachita Mountains (/ ˈ w ɒ ʃ ɪ t ɔː /), simply referred to as the Ouachitas, are a mountain range in western Arkansas and southeastern Oklahoma.They are formed by a thick succession of highly deformed Paleozoic strata constituting the Ouachita Fold and Thrust Belt, one of the important orogenic belts of North America. [3]
Mount Magazine is located due north of Blue Mountain Lake in Logan County, Arkansas, approximately 45 mi (72 km) east of the Arkansas-Oklahoma border. The most scenic route to the top is a 10 mi (16 km) drive along Highway 309 (also known as the Mount Magazine Scenic Byway) from Havana .
The Moorefield Formation, or Moorefield Shale, is a geologic formation in northern Arkansas and eastern Oklahoma that dates to the Meramecian Series of the middle Mississippian. In Arkansas, this formation is generally recognized to have one member, the Ruddell Shale, in the upper Moorefield Formation.
Crowley's Ridge (also Crowleys Ridge) is a 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 present in southern Manitoba and southeastern Saskatchewan, and consists primarily of calcareous shale. It was named for the Favel River near Minitonas, Manitoba, by R.T.D. Wickenden in 1945. [1] [2] The Favel Formation is richly fossiliferous and had yielded remains of a wide variety of marine animals, including the marine crocodile ...