1999  Meeks & Manger, p.141, lower Fayetteville shale 65
           feet; base of section 173 feet below base of Wedington
           Sandstone Mb., exposed on Washington Mountain (SW 1/4,
           NE, sec.. 19, T 16 N, R 30 W, Fayetteville 7 1/2',
           Washington Co.