Fig. 2. — Geologic map of South Mountain in southern Pennsylvania, and adja" 

 cent portion of Cumberland Valley. COk, Knox limestone; Ce, Elbrook limestone! 

 Cwb, Waynesboro formation; Ct, Tomstown limestone; Ca, Antietam sandstone; 

 Ch, Harpers formation; Cm, Montalto quartzite member of Harpers formation; 

 Cw, Weverton sandstone; av, ancient volcanics. 



