Record of Geology of Texas, ISSY-ISOG. 
173 
Hill^ Robert T. 
Mt. ]Sr. F. Dra/ke quoted on the ■Carboniferous. clays of the Color, ado Coal 
Field ( Fourth Ann. Rept. of hhe G-eol. Surv. of Texas, Pt. I, p. 439). 
Mr. W. Kennedy quoted on the brick clays in Grimes and Robertson coun- 
ties (Fourth Ann. Rept. of the Geol. Surv. of Texas, Ft. I, pp. 30, 79) . Vit- 
rified Brick. Paleozoic shales. 
250 . — 
GeO'logy of Parts of 'Texas, Indian Territory and Arkansas adja- 
cent to Red River. 
Bulletin Geol. 'Soc. Amer., Yol. Y, pp. 297-338; pi. 12-13; 
pi. 12. 1894. 
Contents: Comprehensive Position of the Region geologically. .Physi- 
ographic Features: Topography, Drainage; Forest Growith and its Rela- 
tion to Geologic Structure. Geologic Formations and Suceesision. Typical 
Geologic Sections : Preston Section^ — iTrinity Sands, Walnut Clays, Good- 
land Limestone, Beds of the Washita Division, Lower Cross Timber (or 
Dakota) Sands, Eagle Ford Shales, Austin Chalk, (Review of the Section 
topographically. Paris Section — ^Ultima Thule Sectiori’ — Antoine Section 
— Rockport Section. Extent and Topographic Expression of the Terranes. 
Fault Systems and their Influence on Topography and Areal .Geology. 
■Variation of Sedimentation away from Ouchita Shoreline. Washita Divis- 
ion of the Comianche Series: Relation to other Divisiions, Extent of the 
Washita. iComparison of Austin and Denison Sections. Austin Section: 
Shoal Creek Limestone, Exogyra arietina Beds, Fort Worth Limestones. 
Denison Section: Iviamitia Clays, Duck Creek Chalk, Fort Worth Lime- 
■stohes, Denison Beds. General .Remarks on the Sections. Western Shore- 
line of the Washita Division. 'Oscillations of Land and Sea recorded in the 
Region. Conclusions as to the Cretaceous Section. 
On pp. 337-338 of this article will be found a list of pa.pers to date, pub- 
lished by Professor Hill on the Geology of the Texas Region. 
251. Hillebrakd, W. F. 
New Amlyses of Uraninife. 
Amer. Jour, of Scieuce, III, Yol. XLII, pp. 390-393. Xew 
Haven, Xov., 1891. 
Since the publication of a former paper on the occurrence of nitrogen 
in uraninite and on the composition of uraninite in general ,no .advance 
has been made towards clearing up the mystery surrounding the composi- 
tion of that mineral, although considerable work has been clone in certain 
directions, some of which is of sufficient interest to be produced later in a 
separ.ate publication. In addition, several analyses of uraninite have been 
made, the material being, in part from localities hitherto unrepresented by 
analytical data, and these form the subject of the present paper. 
“A fi'rst glance sulficed to show that the ■specimens were not fresh, and 
that therefore .analysis could throw no light on the ultimate composition of 
the minera.l, but valuable data to be obtained as to the presence of or 
absence of nitrogen and of the rare earths furnished ample excuse for the 
work.’’ 
