X 
Record of Geology of Texas, 188V-1896. 101 
150. Dumble^ Edwin T. 
Volcanic Dust in Texas. 
('Correspondence. ) 
Science, E". S., Vol. I, pp. 657-658. June 14, 1895. 
Refierenoe is made to 'an article by Mr. Henry W. Turner bearing the same 
title (Science, N. 'S., Vol. I, /pp. 453-455). 
The first specimen of the niiaterial was received by the Texgus Gleological 
Survey February, 1900. It was colleeted by Mr. W. F. Cummins from 
Ms “Blanco Canyon beds.” 'In the macroscopic slides prepared by the 
Survey diatoms were found in abundance. 
“These diatoms were partially identified by Mr. C. H. Kain and pub- 
lished by iProf. lOoipe in bis firsit notice of the probable Pliocene age of the 
Blanco Canyon beds (Proc. Amer. Phil. Soc., 189'2, p. 123). 
“The diatomaceous chia.racter of this material was further noted by 
Messrs. Lewis Woolman and C. Henry Kain, and the list of species given 
in the American Naturalist for 1892 [Vol. XXVI], p. 505, .under the title 
‘Fresh-iWater iDiatomaceous 'Deposit from Staked Plains, Texas.’ 
“In 1892, an examination ot this material by the writer (Dumble) 
showed the presence lof volcanic dust, but the diatoms constituted by far 
the greater part of the mass examined, and it was therefore classed with 
other materials of a similar kind from the coast region as diatomaceous 
earth, and only those siliceous deposits of like character which failed to 
reveal diatoms were classed as volcanic dust and briefly described in the 
Transactions of the Texas Academy of Science (Vol. I, Pt. I, p. 33. 1892). 
Further reference to these isiliceous deposits are also made by Kennedy in 
the Fourth Annual Report Ceol. iSurv. Texas, pp. 20, etc. 
“The stratigraphic position of the deposit referred to by Mr. Turner has 
been accurately determined. * * * ” Reference .to the Reports of Prof. 
Cummins. Fossils of the Blanco Canyon beds. Quotation from Co.pe. 
151. -, State Geologist. 
The 'Soils of Texas. A Preliminary Statement and /Classification. 
Transactio'ns of the 'Texas Academy of Science, Vol. I, ISTo. 4, 
pp. 25-60; map. Read June 18, 1895. 
Contents:' Introductiion. Soils and their Derivation. Geology. Phys- 
ical Geography. Residual S/oils of the Oo'astal Slope : Soils of the 
Coastal Prairies. Soils of the Tertiary Plain — ^The Reynosa or LaFayette; 
Oakville or Grand Gulf ; Frio Clays ; Fayette iSands ; Yegiia Clays ; Marine 
Belt; Lignitic Belt. Soils of the Black Prairie — ’Ponderosa Marls; Austin 
Chalk; Eagle Ford Shale"; Lower Cross Timbers.. Soils of the Grand 
Prairie — ^V.ola .and Arietina; Washita .Limestone; Fredericksburg; Bosque. 
Residual Soils of the Central Basin: Soil of the Denuded Areas — ^Coal 
Aleasures; Permian. Soils of the Plateaus — ^Cretaceous; Llano Estacado. 
Residual iSoils of the Mountain Regions: Central Mineral Region; Trans- 
Pecos Region. Soils of Transportation: Drift Soils — ^Coastal SRpe; 
Central Basin. Alluvial Soils — ^Coast Prairie Streams; Streams of Rey- 
nosa Plain; Rivers of the Grand Prairie; Rivers of the Basin Region. 
Preliminary Classification of Texas /Soils. Conclusion. 
This paper contains numerous soil analyses taken from “Cotton Pro- 
