Q6 THE PHYSICAL FEATURES OF PRINCE GEORGE^S COUNTY 



Vaughan. T. Way'land. In Addition to the Coral Fauna of the 

 Aqiiia Eocene Formation of Maryland. 



Washington Biol. Soc. Proc, vol. 15, pp. 205-206, 1902. 



Paracyatlius marylandicus Vaughan and Haimesiastraea conferta Vaughan 

 are reported from the Eocene deposits at Upper Marlboro. The latter form 

 had not previously been known to occur north of Alabama and the author 

 considers its occurrence as important in that it furnishes additional evidence 

 for correlating the Aquia of Maryland and Virginia with the Gregg's or 

 Bell's Landing horizon of Alabama. 



1903. 



Abbe^ Cleveland, Jr. Die Fall-Linie de siidostliclien Vereinig- 

 ten Staaten. Sonder-Abdrnck aus den "Vierteljalirsheften fiir den 

 geographischen Unterriclit" (Herausgegeben von Prof. Dr. Heid- 

 erieh), Wien Holzel. ii, Jalirg, 4, pp. 204-210, 2 pis., 1903. 



The "Fall-line" separating the Piedmont Plateau and the Atlantic Coastal 

 Plain is described in considerable detail. 



EiES, Heinrich. The Clays of the United States East of Mis- 

 sissipj)i River. 



U. S. Geol. Surv., Prof. Paper No. 11, pp. 134-149, 1903. 



Describes the clay bearing formations of the county and gives analyses and 

 physical characteristics of the most important clays. 



1904. 

 Case, E. C, Eastman, C. R., Martin, G. C, TJlrich, E. O. 

 Bassler, R. S., Glenn, L. C, Clark, W. B., Vaughan, T. W., 

 Bagg, R. M., Jr., Hollick, Arthur, and Boyer, C. S. Systematic 

 Paleontology of the Miocene Deposits of Maryland. 

 Md. Geol. Surv., Miocene, pp. 1-508, pis. 10-135, Balto., 1904. 

 Contains descriptions and illustrations of all Miocene fossils recognized in 

 Maryland up to that time. Many forms from this county are included. 



Clark, William Bullock; Shattuck, George Burbank; and 

 Dale, William Healey. The Miocene Deposits of Maryland. 

 Md. Geol. Surv., Miocene, pp. xxiii-clv, pis. 1-9, Balto., 1904. 

 Contains a full account of the Miocene strata of the State. 



