Edward T. Luther

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 represented somewhere in Tennessee. Since geology exercises a…

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 extends southwestward for about two hundred miles from its northern end in…