Edward T. Luther

Geological Zones
Tennessee is a narrow state over 500 miles long, with its long axis running east-west across the grain of the geology. Most of the geological provinces of the east-central United States are represente... Continue Reading »
Walden Ridge
Sequatchie Valley is a long, arrow-straight scenic slash into eastern North America's Appalachian Plateau that divides the southern half of its Tennessee portion into unequal parts. The valley ex... Continue Reading »