302 REVIEWS 
the calcareous shales of the Skaneateles, Moscow, and Ludlowville forma- 
tions of New York, this Gaspé sandstone fauna presents a predominant 
agreement, having sixteen identities and six affines, or approximately 50 
per cent. of the fauna.’’ The presence of this Hamilton element in the 
fauna is indicative, according to Dr. Clarke, of an invasion of the latter 
fauna from the west, while the earlier Helderberg-Oriskany fauna still 
occupied the sea in the Gaspé region. An alternative interpretation, the 
invasion of the Hamilton fauna from the south along the Atlantic border, 
should perhaps be considered. ‘The Onondaga fauna is not differentiated 
in the Gaspé region, it being one of the undifferentiated elements in the 
Grand Greve fauna. 
The evidence is thus fairly cumulative that the Gaspé basin was an area of 
rapid evolution during the early Devonic and a center of dispersion from which 
the lines of immigration departed westward. We cannot now say that they did 
not also lead thence eastward. In a later Devonic stage this basin was the 
recipient of migrants from the west. The course of migration into and out of 
the interior Appalachian waters was along a seaway which cannot yet be traced 
step by step, but evidently parallel to the Appalachian folds. There seems now 
a fair presumption of a continuous connection between the Gaspé basin and the 
east by way of the Connecticut trough into eastern New York. The tangible 
evidence of this connection will be set forth more fully hereafter. The Gaspé 
Eodevonic basin extended from the Canadian Archean shield at the north to the 
limit of the Dalhousie beds on the south and contracted in the middle Devonic. 
Apparently there was no free and open connection between it and the parallel 
contemporaneous embayments at the south in which the Chapman and Moose 
River sandstones of Maine were set down. 
The faunas described in this Memoir are illustrated by 48 finely exe- 
cuted lithographed plates which are fully-up to the standard so long estab- 
lished and maintained by the State of New York in her paleontologic 
publications. Not the least attractive feature of the book is the frontispiece, 
a reproduction in color of the painting by Frederick James of that most 
striking landmark of the Gaspé coast, Percé Rock. 
S. W. 
Textbook of Petrology. By F. H. Hatcu. New York: Macmillan. 
This book, which is a fifth edition, revised and rewritten, contains a 
summary of the modern theories of petrogenesis, a description of the rock- 
forming minerals, and a synopsis of the chief types of igneous rocks and 
their distribution as illustrated by the British Isles. The work is concise 
and somewhat comprehensive and may serve very well for an introduction 
to the study of igneous rocks, with the aid of the microscope. Part I treats 
