MARl'LAND GEOLOGICAL SURVEY 49 



UiTLER, P. R. Geology of the Surface Features of the Baltimore 



Area. Johns Hopkins Univ. Circ. ISTo. 21, vol. ii, 1883, pp. 52-53. 



(Abst) Science, vol. i, 1883, pp. 75-76, 277. 



The hard resistant sandstones that outcrop near CoUington (CoUingwood 

 as given in the article) are referred to the Wealden and are said to represent 

 the remnants of a widespread deposit. The conditions that prevailed during 

 the Jurassic, Cretaceous, and Pleistocene periods are briefly described. 



Wilbur, F. A. Marls. Mineral Ptesources IT. S., 1882, Wash- 

 ington, 1883, p. 522. 



Greensand marls of Cretaceous age are said to occur in Kent, Cecil and 

 Prince George's counties. 



1884. 



Heilprust, Angelo. The Tertiary Geology of the Eastern and 

 Southern United States. 



Jour. Phila. Acad. Nat. Sci., vol. ix, pt. i, pp. 115-154, map, 1884. 



The distribution of the Tertiary strata of the State is given approximately. 

 The Eocene is correlated M'ith the base of the Buhrstone or the Eo-lignitic of 

 Alabama and with the London Clay. The Miocene of the State is divided 

 into two formations, the older or Marylandian which is regarded as possibly 

 Oligocene in age, and the newer or Virginian. The former is exposed in 

 Anne Arundel, Calvert, and Charles counties and the latter at Easton, on the 

 Choptank River, and in St. Mary's County. 



Heilprin"^ Angelo. Contributions to the Tertiary Geology and 

 Paleontology of the United States. 4to 117 pp., 1 map. Phila., 1884. 

 Contains a number of articles all but one of which were previously pub- 

 lished in the Proceedings or Journal of the Phila. Academy of Natural 

 Sciences. Some of these articles are listed on preceding pages. 



Merrill, Geo. P. Preliminary note on the Crystalline Schists of 

 the District of Columbia. 

 Proc. U. S. Nat. Mus., vol. vi, 1884, pp. 159-161. 

 (Abst.) Science., vol. ii, 1883, pp. 829-830. 

 A brief description of some of the crystuUus rocks near Washington. 



Merrill, Geo. P. (Notes on the Building Stones of Washington, 

 D. C.) Tenth Census, vol. x. Washington, 1884. p. 357-361. 



Some brief statements descriptive of the local building stones are made 

 though the greater portion of the article consists of a discussion of the 

 building stones used in the building operations of Washington, most of which 

 are brought from a distance. 



