Physical Geography

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Entries - Entry Category: Physical Geography - Starting with E


Numerous earthquakes occur every year throughout the state of Arkansas, but most go unnoticed. Earthquakes that are felt can be startling and serve as good reminders that Arkansas is located near one of the most hazardous earthquake zones in the country. Earthquakes have been documented in Arkansas as early as 1699 by missionaries traveling down the Mississippi River near Helena (Phillips County). Although it is uncommon for major earthquakes to occur a great distance from active tectonic boundaries, earthquakes associated with the New Madrid Seismic Zone (NMSZ) have been some of the largest earthquakes ever to strike North America. The NMSZ is an active earthquake zone extending from Cairo, Illinois, into Marked Tree (Poinsett County). Earthquakes are caused by movement …

Eleven Point River

The Eleven Point River rises in the Ozark Mountains of Missouri near the town of Willow Springs and flows south-southeast, passing through the Mark Twain National Forest and entering Arkansas in Randolph County. It empties into the Spring River west of what is now Davidsonville Historic State Park and lends its name to the town of Eleven Point (Randolph County). The part of the Ozark Plateau through which the Eleven Point River flows was home to human habitation approximately as long ago as 10,000 B.C., according to archaeological excavations near Greer Springs, which empties into the Eleven Point. In addition, a few Indian mounds dating from the Mississippian Period have been located in the valley of the Eleven Point. In …