REVIEWS 649 
Kansas and Southwest Missouri and their Equivalents in Iowa,” by 
Charles R. Keyes; “The Vertical Range of Fossils at Louisiana,” 
embracing an extended table, by Charles R. Keyes and R. R. Rowley ; 
‘‘ Natural Gas in the Drift of Iowa,’ by A. G. Leonard; “‘ The Results 
of Recent Geological Work in Madison County,” by J. L. Tilton; 
“The Drift Section at Oelwein,” by Grant E. Finch ; ‘‘ Evidence of 
a Sub-Aftonian Till Sheet in Northeastern Iowa,” illustrated by a 
section and three full page half tones, by S. W. Beyer; ‘“‘A Pre-Kansan 
Peat Bed,” by T. H. MacBride ; ‘‘ A Summary of the Discussion of the 
Preceding Papers on the Oelwein Section,” by Professor S. Calvin ; 
and ‘“‘ Additional Observations on Surface Deposits in Iowa,” by B. 
Shimek. The remaining papers are chiefly biological. 
Proceedings of the Davenport Academy of Natural Sciences, Vol. VI, 
1889 to 1897. Davenport, 1897. 
In this volume of 400 pages the archeological contributions very 
notably predominate. Some of these, however, possess geological 
interest from their connection with recent deposits. The dignity of 
the volume and of the society is lowered by an endorsement of the 
ridiculous claims of Captain Glazier, which are unworthy of serious 
consideration. 
Stone Implements of the Potomac-Chesapeake Tidewater Province. 
By Wititram H. Hormes. From fifteenth Annual Report of 
the Bureau of Ethnology. J. \W. Powe ., Director. Wash- 
ington, D. C., 1897. 
This paper, though primarily archeological, possesses much geo- 
logical interest because of its bearing upon anthropic geology. It 
consists of an elaborate discussion of the manufacturing of flaked 
stone implements and of the ancient quarry workshops of the District 
of Columbia, in which this manufacture was extensively carried on. 
The geological relations of these quarries and of the terranes in which 
they occur are accurately and fully set forth by sections, photographs, 
and sketches of the clearest possible type. The various stages of 
manufacture are fully elucidated by drawings and photographs, so 
that every feature of the process is most completely and convincingly 
elucidated. The conclusions reached by Professor Holmes are already 
