S'IRGINIA GEOLOGICAL SURVEY. 



PLATE VIL 



jmifiiMm^*^* 



'«Liii-'.!J!i!W*'''""- 



Fig. I. — Xomini Clifi's, Potomac River. Showino- Calvert formation. 



-'•liiliilii^^ 



¥\iX. 2. — Section IVo miles below Bowlers Wharf, Rappahannock River. Sliowing 

 shell marl of St. Mary's formation. 



CALVERT AND ST. MARY'S FORMATIONS. 



