76 
Transactions Texas Academy of Science. 
D'E Ryee^ William. 
ithe strata lay nearly as they have been deposited, and their dip is generally 
insignificant.”' 
Oompact limestone; shell limestone; siliceons limestone; abundance of 
raw materials adapted to the production .of cement, concrete and artificial 
stone; Ornamental and building sands; Clays. 
“The mines in 'Webb county, 25 miles from tLaredo, and connected with- 
it by standard and narrow gauge railroad tracks, turn out monthly about 
2000 tons lof goiod coal. The best coals of these mines are similar in 
appearance and quality to cannel coal. They are superior to the lignites 
land bituminous shales found heretofore in geological strata of the same 
age.” 
108 . Diller, J. S. 
AdmirListrative Report. 
Mntli Ann. Rept. of the U. S. G-eological Surv. 1889. 
(Chalk in Texas), p. 98. 
An announcement of Professor HilTs recent description of Chalk for- 
mations in Texas, Avhich a microscopic examination shows to be “made 
up of the remains of foraminiferal organisms, and therefore true chalk.” 
109. Drake, ' N . F. 
Stratigra'phy of the Triasisie Formation of 'hTorthwest Texas. 
Third Ann. Rept. of the G-eol. Surv. of Texas, 1891, pp. 225 - 
247. Austin, 1892. 
Contents: ilntroductory. Topographical Features. Lithological Char- 
acteristics : iSandstones ; Conglomerates ; Clays. Thickness and Uncon- 
formability. Stratigraphy: The Lower Bed; the Central Beds; Upper 
Beds; Dip of the Formation; 'Springs; Deposition; Local Development. 
“The Triassic formation was examined in the vicinity of Dockum, Dick- 
ens county, by Professor W. F. Cummins, in 1889, and by him described, 
under the name of Dockum beds, in the First Annual Report of the Texas 
iGreological Survey. Tn the Second Annual Report of the Survey, he gave 
a more extended description of these beds, and stated the published con- 
clusions of other geologists concerning the formation in Texas, drawn from 
previous observations. 
“I first saw this formation at Dockum, in company with Professor Cum- 
mins, in 1889, being attached to his party as assistant; but nearly all of 
the present report is the result of. observations made by myself in Texas 
and New Mexico during the past field season. 
“The Dockum beds underlie all, or nearly all, of the Staked Plains of 
Texas and southeastern New Mexico, extend further back into New Mex- 
ico northwest of the Plains, and have some extension under the Cretaceous 
area south of them in Texas. 
“The limit of the Plains on the east, north and west is marked by an 
escarpment which is usually from one to two hundred, and sometimes three 
or four hundred feet high. The basal portion,' sometimes nearly all of 
this escarpment, is composed of the Triassic beds. These beds usually 
