150 THE MINERAL RESOURCES OF PRINCE GEORGe's COUNTY 



tions and contain fewer clay bands, so that the water passes more 

 readily to lower levels. 



Waters of the Eocene Formations. — The character of the Eocene 

 beds is in the main similar to that of the Upper Cretaceous. More 

 clay members are present, however, and consequently conditions for 

 flowing wells are more favorable. The water is almost everywhere 

 heavily charged with iron, and sulphur is also present in places. In 

 this county no flowing wells obtain their supply of water from Eocene 

 strata, but in the adjoining counties, particularly along the Bay 

 shore of Anne Arundel County, many flowing wells obtain moderate 

 flows of fairly good water from horizons within both the Aquia and 

 Nanjemoy formations. 



Waters of the Miocene Formations. — In the southern counties of 

 the State, particularly in Calvert and St. Mary's, important water- 

 bearing strata of Miocene age have been found to yield an abundant 

 supply of excellent artesian water. Within Prince George's County, 

 however, the Miocene strata lie so high that there is little head to 

 the water contained in them, and flowing wells do not occur. Some 

 shallow wells in the southern portion of the county probably derive 

 their water supply from Calvert strata that in St. Mary's County 

 yield artesian water 



