MARYLAND GEOLOGICAL SURVEY 41 



1894 



KEITH, ARTHUR. Geology of the Catoctin Belt. 



14th Ann. Kept. U. S. Geol. Surv., 1892-93, Washington, 1894, pt. ii, pp. 285-395, 

 maps and plates. 



House Exec. Doc., 53d Cong., 2d sess., vol. xvii, p. 285. 

 (Rev.) Sciences, n. s., vol. ii, 1895, p. 97. 

 A full discussion of the area studied. 



. Harper's Ferry Folio, Explanatory Sheets. 



U. S. Geol. Surv. Geol. Atlas, folio No. 10, Washington, 1894. 

 Brief epitomized discussion of the local geology, structure and geological history of 

 the area included. 



1896 



DORSEY, CLARENCE W. The Soils of the Hagerstown Valley. 



Md. Agr. Exp. Sta. Bull. No. 44, College Park, 1896. 



A study of the soils resulting from the disintegration of the Cambrian sandstone, 

 Hudson River shales and Trenton limestones. Distinguished five types. 



WALCOTT, C. D. The Cambrian Rocks of Pennsylvania. 



Bull. U. S. Geol. Surv. No. 134, 1896. 

 House Misc. Doc., 54th Cong., 2d sess., No. 24. 



Contains incidental reference to his work with Keith in Frederick County and also 

 to the southern continuation of Pennsylvania formations. 



WILLIS, BAILEY. The Northern Appalachians. 



The Physiography of the United States. 



Geographic Monographs I, American Book Company, 169 pp., 1896. 



A study of the present topography and its origin. 



1897 



CLARK, WILLIAM BULLOCK. Historical sketch embracing an account 

 of the progress of investigation concerning the physical features and 

 natural resources of Maryland. 



Md. Geol. Surv., vol. i, pp. 43-138, pis. ii-v, 1897. 



. Outline of present knowledge of the physical features of 

 Maryland, embracing an account of the physiography, geology, and 

 mineral resources. 



Md. Geol. Surv., vol. i, pp. 141-228, pis. vi-xiii, 1897. 



Description of the physiographic features of the state, the character and distribution 

 of the igneous and sedimentary rocks, and the mineral resources. 



