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CONTENTS. 
JULY NUMBEli. 
Sketch of the Life axd Work of Augustus Wing. Henry M. Scely. 
LFortrait.] I 
Beach Structures in the Medina Sandstone. H. L. Fairchild. 
[Plates II-VL] 
The Michipicoten Huronian Area. A. B. Willmott. [Plate 
VIILJ 14 
The Age of the Kansan Drift Sheet. Oscar H. Hershey.... 20 
The Georgia Bauxite Deposits : Their Chemical Constitution 
and Genesis. Thomas L Watson. [Plate VIL] 25 
Ihe Age of the Kansan-Oklahoma Red-Beds. /. W. Beede... 46 
A Short Discussion of the Origin of the Co.\l Measures Fire- 
clays. T. C. Hopkins 47 
Nomenclature of the Cambrian Formations of the St. Fran- 
cois Mountains. C R. Keyes 51 
Editorial Comment. 
Supposed Recent Submergence of Siberia 53 
Laboratory and Lecture Methods in Geology at the State 
University of Iowa 54 . 
Guide to the Geology of Niagara Falls 56 
Review of Recent Geological Literature. 
Nitrates in Cave Earths. H. W. Nichols, 58; Mohawkite, 
/. W. Richards, 58 ; On the Origin of the Phenocrysts in 
the Porphyritic Granites of Georgia, Thos. L. Watson, 58; 
Studies for Students (Meteorites), O. C. Farrington, 59; 
Mineralogical Notes, C. H. Warren, 59; A Text-book of 
Geology, A. P. Brigham, 59. 
Monthly Author's Catalogue of Geological Literati're 60 
Personal and Scientific News 62 
Geological Survey of South Dakota, and Washington. Mon- 
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