510 REVIEWS 
he has fully credited the material derived from such sources, which is in 
marked contrast to the custom of some other geologists who have in recent 
years published descriptions of sections located in this area. While these 
chapters will not be so popular with the general reader, for the student of 
ability they will, perhaps, prove the most valuable of the entire book. 
Chapter 7 contains lists of fossils found in the various formations of the 
Schoharie region which have, in part, been compiled from the lists of earlier 
geologists. The next chapter, which is devoted to the physiography, gives 
an account of Howe’s and Ball’s caves. The ninth and final chapter 
considers the Schoharie region in its relation to man, and gives a full account 
of the formations or deposits of economic value. At the close of the work 
is an eight-page glossary of technical terms. ‘The book is profusely illus- 
trated by excellent plates of geological scenery, numerous figures of geo- 
logical structure and fossils. A pocket contains a geologic map of the 
Schoharie and Cobleskill Valleys, on which are represented the following 
thirteen geological divisions, listed in ascending order, viz.: Lorraine 
shale, of Lower Silurian age; Brayman shale, Cobleskill dolomite, Manlius 
and Rondout dolomite and limestone, of Upper Silurian age; Coeymans 
limestone, New Scotland shale, Becraft limestone, Oriskany quartzite, 
Esopus grit, Schoharie grit, and Onondaga limestone, of Lower Devonian 
age; and the Marcellus shale and Hamilton formation, of Middle Devo- 
nian age. It will be readily seen that there is a long list of formations 
available for study which in the high and steep hills bordering the Schoharie 
Valley and in the Helderberg escarpment are admirably exposed. 
The early work of Eaton in Albany County and of the Gebhards in the 
Schoharie Valley brought to the Helderbergs and the valley at an early date 
such famous geologists as Lyell, James Hall, and Louis Agassiz. In later 
years other professors from Harvard, Yale, Columbia, Cornell, Union, and 
other institutions have brought their students to this beautiful and classic 
ground. Now with this admirable Guide at hand this region should become 
a veritable Mecca for geologists. Students of the science are certainly 
under great obligations to Dr. Grabau for the preparation of this excellent 
handbook, and to Dr. John M. Clarke, New York’s efficient and scholarly 
state geologist, for its publication in a most attractive and interesting 
form. 
C. S. PROSSER 
