20 PREFACE 



throughout their eutire extent. This more general chapter is fol- 

 lowed by one in which are given the detailed chemical and micro- 

 scopical examinations on which the broader generalizations are based. 

 The Geology of the Coastal Plain Formations by Dr. Shattuck, 

 includes a discussion of the different geological formations found 

 within the southern portion of Cecil county, with a description of 

 the salient features of the different formations composing this exten- 

 sive series of gravels, sands, and clays. The chapter dealing with the 

 interpretation of the geological record as shown in the deposits of 

 the entire county deserves especial attention, as in it is given an 

 interesting history of the numerous changes which this area has 

 undergone. 



The Mineral Resources of Cecil County, by Edward B. Mathews, 

 deals with the mineral wealth of Cecil county. The chief industries 

 center around the building stone and clay. Occasionally there is 

 some activity in the quarrying of flint, feldspar and iron ore. In the 

 past Cecil county was a prominent producer of iron and chrome. 

 The reports on the clays and building stone are based on the much 

 fuller discussions of these industries already published by the Survey. 



The Soils of Cecil County, by Clarence W. Dorsey and Jay A. 

 Bonsteel, contains a discussion of the leading soil types showing their 

 character and distribution and the crops best suited to each. This 

 investigation was conducted under the supervision of Milton Whitney, 

 Director of the Division of Soils, U. S. Department of Agriculture, 

 who detailed Mr. Dorsey and Dr. Bonsteel to carry on this work in 

 cooperation with the Maryland Geological Survey. 



The Climate of Cecil County, by Oliver L. Fassig, gives a sum- 

 mary of the climatic conditions in the county, and shows what may 

 reasonably be expected concerning the variations in temperature and 

 rainfall during the different months of the year. These conclusions 

 are the result of a careful digest of all the observations recorded at 

 intervals from 1843 down to the present time. 



The Hydrography of Cecil County, by H. A. Pressey, of the 

 Hydrographic Division of the U. S. Geological Survey, contains a 

 complete record of the stream measurements made in Cecil county, 



