^ 146 
Traistsacti GISTS Texas Academy of Science. 
Hill^ Egbert T. 
an immense area in Texas. At San Marcos, New Braunfels, Austin, and 
many other places throughout the central region, the strata are heautifully 
shown. Four miles northwest of the latter city the banks of the Colorado 
afford a vertical exposure of over 700 feet, and yet these are only the 
topmoist sitrata of the series. The strata dip rapidly to the southeast- 
ward.” Pp. 299-300. Lithologic Characters. 
The Central Denuded Region. Its boundaries. Geology. 
The Washita Division. Fauna of the Upper, or Washita Division. 
The Fredericksburg Division, Lithology and Topography. Fauna of 
the Lower or Fredericksburg Division. Basal Contacts. ‘‘Several years of 
most careful study of the stratigraphy of the whole of the'iComanehe- Series 
fully confirms its position to be lower than the strata of the Lower Cross 
Timber beds, which 'Shumard, White and other authorities have asserted 
to be identical with the Dakota iSandstone of Meek and Llayden, and hence 
lower than any of the hitherto described marine groups of the American 
Cretaceous.” Paleontologic (break between the Comanche and upper series. 
Review of the Fossils of the Comanche Series. Conclusions. 
199. 
The Present Conidition of Knowledge ol the Geology of Texas. 
Bnlletinj of the United States Geological Snrveyj Ko. 45, 95 
pp. Washington, 1887. 
Contents: Prefatory Note. I. iHistoric Statement of Geologic Inves- 
tigation. Knowledge at the P)aginning of this Century. Anglo-American 
Adventurers and Colonists: Philip Nolan; American Colonization Period. 
European Investigators : Mhlliam Kennedy; G. A. (Scherpf; Pi'ince Carl 
'Solms-Braunfels; Victor Bracht, Ferdinand iRoemer. United States Mili- 
tary Reconnaissances and Explorations': Reconnaissances; Explorations: 
Exploration of the Red River of Louisiana; United States and Mexican 
Boundary Survey; Pacific Railroad /Surveys : Thirty-fifth Parallel Survey; 
Thirty -second Parallel tSnrvey; Artesian Well Experiment, Geologic Sur- 
veys conducted by the State: The Texas Land Olfiee; First Geological 
(Survey (Shumard) : Organization and Equipment ; Field Labors; Methods 
of 'Survey; Maps; lOpenations of 18G0; Official Results; Indirect Results; 
Expense, Second Geological Survey (Glenn-Buekley) : Operations of 
1874; Operations of 1875. Recent Miscellaneous Investigations: Individ- 
ual Contributors; Work of the Lhrited States Geological Survey. .Succes- 
sion of Scientific Exploi ations. 
II. Summary of Re.iultS:: Topography: Classification of Topography 
of Texas; Chart illustrating Progressive Class'ification of Topographic 
Features- Historic Geology and Stratigraphy:- Ta-ble of Geologic Forma- 
fions of Texas, with AuthiOrities; So-called Archaean and Earlier Paleozoic; 
Carboniferous System: Central Carbonifei-ous .Area, Trans-Pecos Carbon- 
iferous Area. General Conclusions respecting the Texas .Carboniferous. 
So-called Permian or Permo-iCar'boniferous ; Trans-Pecos Re,gion of Shu- 
mard; Permian of Cope and his Assistants. Jura-Trias or Gypsum Strata. 
So-called Jurassic, Cretaceous. So-called Laramie. Tertiary. Quater- 
nary and Other Post-Tertiary Strata. Geological Deductions. General 
