MARYLAND GEOLOGICAL SURVEY. 



DEVONIAN, PLATE 



NORTH AHER(6AM PALEOGEOCIRAPHY 



BYCHARLES SCHUCHERT 1909 



EXPLANATION OF SYMBOLS 



LANDS ARE white:. 'WA TER AREAS ARE LINED. 

 FORMATION OUTCROPS 50 LI D BLACK OR DOT TEID. 



KNOWN SHORE-LINE.S ARE SOLID LINES; PROBABLE ONES BROKEN 

 PAG I F IC MARINE. 



ATLANTIC marine: 



GULF MARINE 



ARCTIC MARINE 



MARINE GYPSUM. OR SALT OR BOTH 



INTERBEDDED MARINES- CONTINENTAL DEPOSITS 



CONTINENTAL DEPOSITS 



^ ^ -^ VOLCANIC EXTRUSIVES 



EXPL.\N.\TION OF SYMBOLS. 



