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QAPF diagram with basalt/andesite field highlighted in yellow. Andesite is distinguished from basalt by SiO 2 > 52%. Andesite is field O2 in the TAS classification.. Andesite is an aphanitic (fine-grained) to porphyritic (coarse-grained) igneous rock that is intermediate in its content of silica and low in alkali metals.
The Bearwallow Mountain Andesite is composed of calc-alkaline volcanic rock ranging from basaltic andesite to dacite, but predominantly andesite.These form a group of low cones or shield volcanoes and range in age from 27 to 23 million years old.
Andesites is an extinct genus of cephalopod belonging to the Ammonite subclass, from the Late Jurassic. It has only been found in the Mendoza Group of Argentina. [1]
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 Felsenthal National Wildlife Refuge (NWR) is a 76,000 acre (307.56 km 2) national wildlife refuge located in south-central Arkansas in Ashley, Bradley, and Union counties. Felsenthal NWR is one of three refuges forming an administrative complex, which also includes Pond Creek NWR to the northwest and Overflow NWR to the east. [2]
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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 Jones Mill Site, designated by the Smithsonian trinomial 3HS28, is a prehistoric archaeological site near Jones Mill in Hot Spring County, Arkansas.It is a deeply stratified site, with evidence of human habitation in at least three different time periods.