VIR<iINIA GEOLOGICAL SURVEY. 



PLATE VL 



Fig. 1. — niull at J'(i|M'~ ( icik. I 'i M I 'iii.K' i;i\(i. \l;i r\ 1,1 11(1. sliowiny Zduc 17 of 

 Nanjenioy formation overlain hy iliatoiiiai-coiis eaitii hrds of Calvert formation. 



l-'iy. 1. — lilull al ll()|iyarrl, Eappaliannock P.ivcr. Sliowinti- calcarcon- concretions 

 of A(|uia formation. 



NAN.7EMOV AND AQUTA FOmfATTONS. 



