REVIEWS 675 
Part IT is a more detailed discussion of the geology and physiography 
of the region. The geology is dealt with by physiographic provinces and 
includes sedimentary, igneous, and metamorphic areas, and, stratigraphi- 
cally, rocks from pre-Cambrian to Recent. ‘The discussion of the under- 
ground water resources, which forms the greater part of the paper, 
includes an explanation of the general principles involved and local de- 
tailed descriptions of the resources by counties. There are appended 
to the report eleven tables of statistics of various sorts. 
A. C. McF. 
William Smith, His Maps and Memoirs. By T. SHEPARD, M.Sc., 
F.G.S. Proceedings of the Yorkshire Geological Society, N. 5., 
Nol exe Part Lil yep. 273: 
William Smith was one of the pioneer English geologists in strati- 
graphic and areal work. The report consists of descriptions of his 
various maps and writings, the first produced in 1799 and the last in 
1827. It includes many reproductions of the original diagrams and 
charts. 
A. C. McF. 
Upper Cretaceous of Maryland, Systematic Report. Maryland 
Geological Survey, 1916. Pp. 1022, pls. 7 (general), go (pale- 
ontological). 
I. The Upper Cretaceous Deposits of Maryland,’ by W. BuLtock 
CLARKE.—Under this heading is included a discussion of the general 
geology of the Coastal Plain region of the state, to which the Cretaceous 
deposits are limited, including the physiography, stratigraphy, structure, 
and conditions of sedimentation. A bibliography and table of distri- 
bution of the fauna and flora are also given. 
II. “‘Petrography and Genesis of the Sediments of the Upper 
Cretaceous of Maryland,’ by Marcus I. Gorpman. Based upon 
petrographic and field evidence-—The author finds three types of 
sediment present, (1) delta type, (2) lagoon type, and (3) open-water 
glauconitic type. A brief discussion of the origin of glauconite and the 
methods of petrographic examination is given. 
III. ‘‘The Upper Cretaceous Floras of the World,” by E. W. Berry. 
—No attempt at detailed correlations of these widely scattered floras is 
made. A discussion of the place of origin and subsequent migrations 
of the great dicotyledonous flora, which makes its sudden and dominating 
