Recoed op Geology of Texas, 1887-1896. 
169 
Hill^ Robert T. 
Condifcions foT occurrence of rock kaolin good. Decompo'sed outcrops of 
granite in 'Burnet, Llano, Gillespie .and Ma.son counties. Kaolin in Edwards 
county^ Tertiary and ■Cretaceous clays of Eastern Texas. Terrace alluvial 
and littoral deposits. Brick at Houston, Texarkana, Dallas, Waco and 
Austin. Clay at DallaSr' Clay beds of the Miocene. K.. A. F. Penrose quoted. 
Geological horizon of beds. 'Their possible use. Clays of the Eocene for- 
mation. Thickness of beds. Character of clay. Outcrops., Elgin brick. 
Calcarous clays of the Cretaceous. Deposits in the Eagle Ford shales. 
Exposures. Plastic clays at the base of the Lower Cretaceous (Trinity). 
lExposures. Clays of the Carboniferous and Perm,ian. Clays of the Red 
Beds. Negative character of the Great Plains Tertiary. Clays in the 
Trans-Pecos mountainous region. The Benton claysj Texas Clays from 
the report of the State Geologist. 
244. 
Tlie CretaceO'iis Formations of Mexico and their Relations to 
North American Geographic Development. 
Amer. Jonr. of 'Science, III, Vol. XLY, pp. 307-324. New 
Haven, April, 1893. 
(Age and Homotaxial Relations of the Comanche 'Series in 
• Mexico and Texas, p. 313.) 
The diverse opinions concerning the age of the Mexican Cretaceous. Felix 
and Lenk maintain the Neocomian age of the Tehuacan beds. Most Mexi- 
can geologists speak of the Hippurites. limestone as probably Upper Cre- 
taceous. Prof. Heilprin maintains the Upper Cretaceous age of both the 
Mexican and Texas Cretaceous. His mistake. Discusision. 
“If those who doubt the Heooomiau position of the faunas of basal half 
of the Comanche Series will compare niy unpublished collections in the 
possession of the Texas Geological- 'Survey land at my residence in Wash- 
ington with the beautiful Cretaceous faunas of Portugal as illustrated by 
Choffat they will no longer doubt the homotaxial identity of the beds, but 
will be astonished at the wonderful and striking generic identity.” 
On p. 324 there is a tabulated statement of the- “Known Positio'ii of the 
Cretaceous and related Formations in Mexico” in which their occurrences 
in the United IStates (Texas) is shown. 
245. 
Paleontology of the Cretaceous Formations of Texas — ^^The Inver- 
tebrate Paleontology of the Trinity Division. 
Proceedings of the Biological Society of Washington, Yol. 
_YIII, pp. 9-40, pis. i-viii. June 3, 1893. 
Contents : T. Stratigraphic Divisions and Nomenclature of the Coman- 
che iSeries. Idj Position and Charaoteristies of the Trinity Division. The 
Basement Beds or Trinity 'Sands proper. The Glen Rose Beds. Aggrega- 
tions of Bpecies in Great Beds. Coquina Beds. The Oyster Agglomerate. 
The Vicarya Beds. Orbitulites Chalk. The Requienia ( “Oaprotina” ) 
Limestone, The Nerinaea Flags. HI, Fossils of the Trinity Division 
