MARYLAND GEOLOGICAL SURVEY 13 



PAGE 



The Intekpbetatiox of the Geological Record 98 



Sedimentary Record of the Chesapeake Group 98 



Sedimentary Record of the Lafayette Formation 98 



Sedimentary Record of the Columbia Group 99 



THE ECONOMIC RESOURCES OF ST. MARY'S COUNTY. By Benjamin 



L. Miller 113 



Inteoductory 113 



The Nati'ral Deposits 113 



The Clays H^ 



Tertiary Clays H^ 



Quaternary Clays 115 



The Sands 117 



The Gravels US 



The Building Stone 118 



The Marls 119 



The Diatomaceous Earth 120 



The Water Resources 121 



Springs 121 



Dug Wells 122 



Artesian Wells 122 



The Eocene Horizon 123 



The Miocene Horizons 123 



THE SOILS OF ST. MARY'S COUNTY. By Jay A. Boxsteel 125 



iNTBODtlCTORY- 125 



The Soil Types 126 



The Norfolk Loam 126 



The Leonardtown Loam 127 



The Susquehanna Gravel 129 



The Windsor Sand 130 



The Norfolk Sand 131 



The Sassafras Loam 133 



The Sassafras Sandy Loam 134 



The Meadow Land 136 



The Swamp Land 138 



The Agricultural Conditions 139 



The Transportation Facilities 144 



THE CLIMATE OF ST. MARY'S COUNTY. By C. F. von Herrmann 147 



Introductory- 147 



Climatic Data Available for St. Mary's County 148 



The Temperature Conditions 151 



Thermal Anomalies 155 



Precipitation 158 



