160 Reviews—Prof. Prestwich’s Geology, Vol. IT. 
period of incoming of the different classes, and the orders and 
genera peculiar to the Paleozoic, Mesozoic, and Kainozoic eras. In 
the various tables which he has prepared the author acknowledges 
his indebtedness to the elaborate work on Stratigraphical Geology 
and Paleontology issued in 1885 by Mr. Etheridge. 
Of great value to students will be the excellent accounts of the 
foreign equivalents of our strata, one of the most important features 
in this work. Not only are the sedimentary rocks in different parts 
of Europe described, together with their chief paleontological 
features, but the rocks so far as they have been determined in other 
parts of the globe are likewise mentioned: so that with the aid of 
the geological map of Europe prefixed to this volume, and the 
smaller geological map of the world prefixed to the former volume, 
the student can follow out the geographical distribution of the main 
divisions of the strata and make himself acquainted with the 
principal facts in their life-history. Several Tables of Strata are 
given in the volume before us. Table I. shows the Sedimentary 
Strata in England and their Correlation with some of the principal 
Continental Groups. Then follow Tables of the formations in 
India, North America, Australia, New Zealand, and South Africa ; 
these include lists of the characteristic fossil genera of the principal 
divisions, and a column showing the probable age of the formations 
compared with the general “ time-divisions”’ in Europe. 
It appears likely that the Table of English formations was printed 
off some time before the rest of the work was in type, for we notice 
several discrepancies between the grouping adopted in the table and 
that in the text. Thus in the former the Folkestone Beds are placed 
with the Gault, and in the latter they are grouped with the Lower 
Greensand. The Lenham Sands are doubtfully placed with the 
Miocene in the Table, and later on they are provisionally placed 
with the Pliocene; the Bure Valley Crag is classed as pre-Glacial 
in the Table, while in the text further on it is grouped with the 
Pliocene as part of the Norwich Crag. Moreover, in this Table the 
Recent deposits are not given so much prominence as they are 
in Table IJ., and curiously enough they are separated from the 
Quaternary Period. The term Kainozoic should be employed as 
a comprehensive term to embrace both Tertiary and Quaternary. 
The terms pre-Glacial and post-Glacial are still used by Prof. 
Prestwich, although vague terms of this character are much to be 
deprecated, as they are liable to be used in different senses by 
different writers, and they have thus no definite chronological value. 
Noteworthy instances of this have occurred at recent meetings of the 
Geological Society. 
The term Oligocene is adopted, the Permian is grouped with the 
Palzeozoic, while the Silurian is employed in the old Murchisonian 
sense, although the term Ordovician, now very largely used for the 
‘“ Lower Silurian ” strata, is mentioned in a footnote. On the 
whole, however, we are glad to find that the old familiar names of 
formations are used by the author. 
If the labours of original workers are more or less hidden in 
