MAKYL.VXD GEOLOGICAL SURVEY 31 



that year, the coast line and tlie interior of Calvert Countv were surveved 

 and subsequently published in four sheets. Each one of these sheets, 

 however, included portions of territory lying outside of Calvert County. 

 These four sheets are, beginning with the northern, Owensville, Prince 

 Frederick, Tjconnrdtown, and Drum Point. The cartographic work of 

 tlie I'nited States (.Jcological Survey was in advance of any which had 

 been previously attempted in Calvert County. The quality of the work was 

 no better tlian that published by the United States Coast and Geodetic 

 Survey, but while the former confined its efforts mostly to the water- 

 ways and mapped the adjacent land only a mile or two from the coast, 

 the United States Geological Survey mapped the entire land area. The 

 map was printed in tlnee colors, blue, brown, and black. The hydrography 

 was represented in hhie and went into great details, including not only 

 the larger water-ways, but also the smaller streams and their minute 

 branches. Eelicf was represented by contours with a 20-foot interval 

 and printed in brown; while the culture, iiieludin,g higlnvays, bridges, 

 railroads, liouses, and the names of important localities, was printed in 

 black. 



The present Maryland Geological Survey, in co-operation with the 

 liiJlrd Slates Geologit-al Survey, revised this map in the year 1900, and 

 it is on this base that the geologic formations of the county have been 

 mapped. 



THE HISTORY OF GEOLOGIC RESEARCH.* 



From an early date the attention of geologists has been attracted to 

 Calvert County. The reason for the great interest in this region is 

 ]irobably due not only to the extensive deposits of fossil beds which are 

 found within its borders, but also to the fine and e-ontinuous exposure 

 whieli is found in the Calvert Cliffs along the entire eastern margin of 

 tlio county, as well as in numerous places on the western side along 



''Many of the broad generalizations of the early investigators in southern 

 Maryland apply to the entire region although specific localities are seldom 

 mentioned. In preparing this historical sketch, it has been necessary to 

 refer to these papers although few of the.ni mention the name of Calvert 

 County. 1 



