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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 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. [9] Operated by the Arkansas Fish and Game Commission (AGFC) and opened in 2004, the Center includes an exhibit area, discovery room, observation tower, meeting ...
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
The invertebrates of Arkansas's Cretaceous sea included clams, echinoids, oysters, and snails. [4] During the Cretaceous, Arkansas was home to Belemnitella, Exogyra, Ostrea, Turritella, and other marine invertebrates in the Arkadelphia area of Clark County. [1] Fish of the same age left behind teeth in the area near Saratoga in Hempstead County.
The axis of the rift area may contain volcanic rocks, and active volcanism is a part of many, but not all, active rift systems. Major rifts occur along the central axis of most mid-ocean ridges , where new oceanic crust and lithosphere is created along a divergent boundary between two tectonic plates .
"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Archaeologists believe they may have discovered the final location of Noah’s Ark on Turkey’s ...
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 ...
They could once be found all throughout Arkansas, but had more-or-less vanished by 1920, the Commission said, but there have been 23 confirmed sightings in the state beginning in 2010.