AWALORS ABSTRACTS. 987 
and sulphur, hence well adapted for raising steam and forge work. Its 
coking qualities are specially commended. It is claimed that the well- 
known fact that the best coking coals in Pennsylvania and West Vir- 
ginia lie toward the eastern side of this coal field is equally true of Ala- 
bama. A comparison of the cokes produced in these three regions 
seems to prove that this claim is well founded. 
At present peculiar economic conditions confine active mining to 
two points. It is confidently hoped, however, that these conditions 
will be overcome in the near future, and that extensive developments 
will result from the information disseminated by this report. | 
The Structure of Monument Mountain in Great Barrington, Massachu- 
setts. By T. NELSON DaLe. Fourteenth Ann. Report of the U.S. 
Geol. Survey, pp. 557-65. 
Following up some studies of the late Professor J. D. Dana, the 
author shows that this mountain is either of Cambrian age and sepa- 
rated from the Silurian schist mass of Lenox Mountain on the north 
by a zigzag fault, similar to that described in his other paper as occur- 
ting at Dorset Mountain, or else of Lower Silurian age with either 
a sharp fold or normal fault on its eastern side. ‘The latter view 
involves a local change in the character of the Silurian sediments. 
Since the publication of the paper the author has revisited the 
locality with Professors C. R. Van Hise and B. K. Emerson who regard 
the fault theory as the more probable one. The question then arises 
whether such a transverse fault would not necessitate a longitudinal 
fault on one or both sides of the mass. 
On the Structure of the Ridge between the Taconic and Green Mountain 
Ranges tn Vermont. By T. NELSON DALE. Fourteenth Ann. Report 
of the U. S. Geol. Survey, 1895. 
A topographic and geologic map of four square miles of the ridge, 
sections, sketches and illustrations of clearage phenomena, ‘torsional 
grooving,’ Pteropod odlite, etc., are given. The ridge is a complex 
anticline of Lower Cambrian quartzite, etc., overlain by the Cambro- 
Silurian “‘ Stockbridge Limestone” followed by the Lower Silurian “ Berk- 
shire schist,’ measuring 2000-3200 feet. This anticline is faulted by a 
double fracture letting down a block several hundred feet wide into 
the anticline to a depth of 1500 feet and in other places by a reverse 
