259 
HEVIEW OF RECENT GEOLOGICAL 
LITEEATURE. 
Tlie Co^ivinche ftcries of the Tcrffx-Arkunsas region. By Robert T. Hill. 
Bulletin, Geological Society of America, vol. ii, pp. 503-528; May 5, 1891. 
The main area of the Comanche series is stated to extend from western 
Arkansas through southern Indian Territory to the meridian of 97 30, 
thence southward and southwestward across Texas to New Mexico, a 
•distance of more than 1,000 miles, and then southward indefinitely into 
Mexico. The series, as studied by Mr. Hill iu central Texas and north- 
ward, is made up of eleven terranes, classed under three divisions in 
ascending order, as follows: A. The Trinity division, comprising 1. 
Trinity or basal sands, which Dr. C. A. White provisionally regards as 
the base of the North American lower Cretaceous; and 2. The Glen 
Rose or alternating beds, consisting of abundantly fossiliferous magne- 
sian limestones, tine sand, challi, and almost pure crj'stalline limestone. 
B. The Fredericksburg or Comanche Peak division, comprising 3. The 
Paluxy sands, about 100 feet thick, containing no fossils excepting 
silicitled wood; 4. The Gri/pJui^n rock and AValnut claj's, the former 
being a stratum 10 to 50 feet thick, composed entirely of the shells of a 
small GrypJum, and the latter being associated clay marls which enclose 
myriads of Exogt^ra tesaita Roemer; 5. The Comanche Peak chalk, 
about 100 feet thick, rich in many species of fossils; 6. The Coprina 
limestone of Shumard, an indurated chalk, 30 to 40 feet thick, preserved 
as the capstone of many buttes, mesas, and plateaus; and 7. The Good- 
land limestone, apparently an equivalent of the last two. C. The 
Washita or Indian Territory division, comprising 8. The Kiamitia clays 
or Schloenhiichia beds, so named from their characteristic Ammonites; 9. 
The Duck Creek chalk, about 100 feet in thickness, composed of crumbl- 
ing chalky limestone and marls, with a unique fauna: 10. The Fort 
Worth limestone, which with the last was described by Marcou at Fort 
Washita as typical Neocomian; and 11. The Denison beds, made up of 
sandy clays and occasional limestones, Exoggrn nrletinn l)eing the 
characteristic fossil of the clays. At Denison and throughout northern 
Texas, these beds are unconformably overlain by the Dakota sandstone, 
the base of the upper Cretaceous series which is so widely developed on 
the plains farther north, 
CarhoniffroitH fossils from Neirfoundland. By Sir J. William Dawson. 
Bulletin, G. S. A., vol. ii, pp. 529-540, with two plates; May 27, 1891. 
The plants described or catalogued with annotation in this paper are 
from St. George's bay, in western Newfoundland, the most noteworthy 
species being Jjejiidodendron murnijidnnni, nearly like L. cUftoiicnxe of 
Nova Scotia. The strata are similar to those of the coal formation of 
Cape Breton, and have a total thickness of pri>bably 11 000 feet. Accord- 
ing to Mr. James P. Howley, now director of the Geological Survey of 
Newfoundland, they contain six beds of coal, ranging from fourteen 
