106 IVEUE SW OMURNVAIE QUE (GIEOUL OCI, 
whole, regularly disposed formations are not free from considerable — 
deformations. A fault has been found in the western part of the state, 
having a vertical throw of at least 200 feet. Two distinct and broad, 
though rather low, anticlines have been found inthe same region. Both 
of them have a northwest southeast course. Neither of them appears 
to have affected the drainage of the region where they occur. 
The subdivisions of the Cretaceous are given above. It is worthy 
of note that the four subdivisions of the formation which occur in the 
western part of the state cannot all be carried across to the eastern 
border, the two uppermost members, the Ripley and the Rotten Lime- 
stone, losing their distinctness. The name Se/ma Chalk is proposed as 
a substitute for the old name ‘Rotten Limestone,’ and it is to. be 
hoped that the change may be generally adopted. 
In connection with the Cretaceous, it is pointed out that the Tus- 
caloosa is probably the equivalent of the Amboy (Raritan) clays of 
New Jersey, and that this formation seems to hold its character from 
Massachusetts to Alabama. Judged from the physical standpoint, the 
other members of the Cretaceous of Alabama cannot be said to have 
much in common with their northern equivalents. 
Many details are given concerning the paleontology of the forma- 
tions described. The microscopic fossils, as well as the larger ones, 
have received a considerable measure of attention. 
Through the whole series of the Cretaceous, Tertiary and Pleisto- 
~cene formations of Alabama, the influence of the Mississippi River 
has been felt, a large part of the coastal plain region of Alabama 
coming within the great Mississippi embayment of these periods. The 
rivers which cross the coastal plain are all of recent origin. 
‘The later part of the volume is occupied by county descriptions 
which possess a local interest, and give many sections which will be of 
value to students of coastal plain geology, since they will offer a basis 
for classification and correlation. 
The economic resources of the coastal plain region are not neglected. 
This part of the state is far less rich in economic products than the 
northern part, where the great iron and coal industries flourish. Never- 
theless the phosphates and clays of the central and southern parts of 
the state are of value, and when more extensively used the former 
seem destined to have an important bearing on the agricultural wel- 
fare of the state. 
The phosphates are found at several horizons, but the most impor- 
