392 The American Geologist. •'""«• ^^"'^ 
dosalic. perpelic, domalkalic and dosodic, differing in order, range 
and subrange from Lindgren's grano-dioryte. A comparison of the 
grano-diorytes of the two ranges shows them to be very similar. 
There is a central mass of coarse grained acid rocks bordered on 
the south by finer grained grano-diorytes, gneisses and quartz-mon- 
zanyte. Hornblende dykes are not numerous but alpytes cut the 
rocks of the entire region. The metamorphic rocks are abundant 
in the southern part of the range. A. J. 
Maryland Geological Survey; Miocene. William B. Clark, State 
Geologist. Text, pages civ, 543, with nine plates; and volume 
of plates, x-cxxxv. 1904. 
These two sumptuous volumes give us the most complete ac- 
count in existence of the Miocene deposits and fossils of Maryland. 
The introduction and account of the general stratigraphic relations 
was written by the State Geologist, Dr. Wm. B. Clark. The account 
of the geological and paleontological relations, with a review of 
earlier investigations, is contributed by Dr. George B. Shattuck 
who has devoted much time to the field study of its stratigraphy. 
His comparative taxonomic table shows at a glance the evolution 
of the classification and correlation of the Maryland Miocene from 
the alluvial (in part) of Maclure in 1809 to that of Shattuck in 1902, 
who divides the Maryland Miocene into three formations, which in 
ascending order are the Calvert, Choptauk and St. Mary's. As a 
result of the careful study of the fossils the thr6e formations have 
been divided into 24 zones. This part of the work closes with a 
series of sections, mainly along Chesapeake bay, and an extensive 
table giving the geological range and geographical distribution of 
all the species listed. 
The relations of the Maryland Miocene to that of other regions 
and to the recent fauna are discussed by Dr. W. H. Dall. The State 
Geologist reports that "This chapter is by far the most important 
contribution to the interpretation of the Maryland Miocene deposits 
which has been hitherto made and shows in a highly philosophical 
manner the relationship of the Maryland Miocene fauna to that of 
other regions and to the recent fauna." Dr. Dall concludes that 
"In a general way. allowing for local peculiarities, the Miocene 
fauna of North Germany compares well and agrees closely with that 
of Maryland, while the Mediterranean Miocene finds a closer ana- 
logue in the mdre tropical fauna of the Duplin beds of the Caro- 
linas." This chapter closes with a list of the characteristic species 
of the North American Miocene. In explanation of this list Dr. Dall 
states that "By characteristic are meant the species which occur 
only in the Miocene, and occur in it from top to bottom. * * * 
It is not meant that they occur at every horizon or zone, but that 
they have existed throughout the Miocene somewhere, and disap- 
pear with the inauguration of the Pliocene." 
The Systematic Paleontology has been prepared by different 
