SOUTHERN AND CENTRAL APPALACHIANS 

 Osp Om\ Osp 



Oc V 

 OpsU s P QrrV 



117 



Mm 



Orr 



MMk 



Os ». 



\ 



0€c 



Os Orr 



0€c 



mm« 



a\\\ 



Os 



0€c 0€c 



GREAT VALLEY, MARYLAND 



AFTER SANDO, 1957 







i— 



I 



2 

 i 



3 Miles 



BLUE RIDGE 



BLUE RIDGE, LOUDOUN COUNTY, VIRGINIA 



SHORT HILL 

 €wu €wm €wl 



AFTER NICKELSEN,I956 



Fig. 8.24. The Great Valley (Shenandoah) and Blue Ridge in Maryland and northern Virginia. 

 For location see Fig. 8.22. Om, Martinsburg shale; Oc, Chambersburg limestone; Osp, St. Paul 

 group (limestone); Ops, Pinesburg Station dolomite; Orr, Rockdale Run formation; Os, Stonehenge 



chiefly by the Carolina slate belt, which extends from Virginia through 

 the Carolinas into Georgia (see Fig. 7.1). Its rocks are slates, graywackes, 

 pyroclastics, and lavas, which are only moderately folded or meta- 

 morphosed except near some granitic body. Still farther southwest in 



limestone; OCs, Conococheague formation; Cc, Tomstown formation; Ca, Antietam quartzite; €h. 

 Harpers formation; €wu, €wm, and Cwl, Weverton quartzite; CI, Loudon formation; pCc, Catoctin 

 metabasalt; p€sr, Swift Run phyllite; pCg, gneissic basement. 



southwestern Georgia and southeastern Alabama is the smaller Pine 

 Mountain belt of quartzite, marble, and schist. The age of the rorks 

 of both the Carolina slate belt and Pine Mountain belt is unknown, but 

 recent workers are inclined to think they may be early Paleozoic and 



