MARYLAND GEOLOGICAL SURVEY 



EOCENE, PLATE V 



THICKNESS 

 IN FEET 



Greensand, with Ogtrea sellafformit, ileretrix siihimpressa, 

 \'eneiicii7'dia 2>u((tpacoeiisis, etc. 



Greensand, with few fossils, chiefly Veiiericardia potapa- 

 coensis, 



Greenish-srey argillaceous sand with inconstant indurated 

 layer at top and with many typical fossils, 



Greenish-gray argillaceous sand, with bands of gypsum crystals, 

 Light-gray greensand, with Venericardia potapacoensis. 



Greenish-gray argillaceous sand, 



Indurated argillaceous greensand, 



Argillaceous greensand with clay bed at base. 



Interstratified indurated layers andgreensands with many 

 TuiTitella mortoni, 



Light greenish-gray greensand, with Turritella mortoni, 

 CucuUaea gigantea, Crassatellites alaeformis, Ostrea cotn- 

 pressirostj'a, etc., 



Greensand, with fragments of shells of lower beds, - - - 7 



Greensand, with corals, 1 



Ind. greensand, v^ith Pholadomya marijlandica,& Phenacomyapetro&a, 2 



Greensand, -...- g 



Indurated greensand, a 



Dark greensand with many fossils, including Dosiniopsis 

 lenticularU, Mereti'ix ovata var.pyga, Crassatellites alae- 



formis. and Ostrea compressirostrd, 1 a 



Greensand, at times argillaceous, 3c 



^^ 



?y^ 



. Woodstock 

 Member 



Potapaco 

 ^ Member 



Paspotansa 

 Member 



a 



o 

 d 



a 



u 

 o 

 fcl 



t» 

 o 



a 



o 

 eS 



, Piscataway 

 ' Member 



SCALE 40 FEET=1 INCH 



GENERAL COLUMNAR SECTION OF EOCENE STRATA IN Z^IARYLAND 



