Record of Geology of Texas, 1887-1896. 
275 
438. Williams/ Albert, Jr,, Editor. 
Art. IJseful Minerals of the United States. Min, Resources of 
the U. S., 1887. 
(Minerals imined in Texias), pp. 792-793. Washington, 1888. 
(Minieral not mined in Texas), pp. 793-794. 
A tabulated list of minerals, alphabetically arranged, giving mineral- 
ogieal name, common name and remarks on each species. Under the latter 
are included localities and, in some instances, extent of deposits, use, etc. 
The following minerals are “mined” in Texas : Clay, Coal, var. bitumin- 
ou'S; Coal, var. lignite; Halite (salt) ; Kaolinite; Uimestone; Sandstone; 
Silver. The fiollowing minerals are “not mined” in Texas: Agate; Ame- 
thyst; Asbestos; Bismuth oi-e; Chalcedony; Chalcocite; Feldspar; Gialen- 
ite; Carnet; Granite; Gypsum; Ilmenite; Jasper; Limonite; Magnetite; 
Marble; “Molybdenum ore”; Hitre; Obsidian; Ochre; Opal; Petroleum; 
Pyrite; Pyrolusite; Slate; Talc; Tourmaline, 
439. Williams, J. FRAitois. 
Igneous Rocks of Texas. 
Ann. Rept. of the Geol. Snrv. of Arbansas for 1890, Vol. II, 
pp. 5-6. Tittle Rock, 1891. 
A brief notice of the work of Messrs. Hill and Kemp (See Pilot Knob: 
A Marine Cretaceous Volcano, by Robert T. Hill, with notes on its Petro- 
graphy by J. F, Kemp. Amer. Geol., vol. VI, p. 286). Allusion is also 
made to the Pre-Cambrian rocks of the Central Mineral Region as described 
by Comstock. ( See First Ann. Rept. of the Geol. Surv. of Texas, p. 239.) 
' 440. WooLMAK, Lewis and Kain, C. Henry. 
(List of Species, found tin a. ^^Fresh Water Diatomaoeous Deposit 
.. from the Staked Plaiins^t) 
Amer. Haturalist, Vol. XXVI, pp. 505-506. June, 1892. 
“The following number of species, twenty-seven in number, though not 
exhaustive, is nearly so: c 
Amphora ovalis 'Ehr. ; Amphora uncinatum Ehr. ; Achnanthes ventricosa 
Ehr. ; Campylodiscus clypeus Ehr.; Cymhella cistula Hempr. ; Gymhella 
lanceolatum Ehr.; Denticula valida Pediceno; Epithemia gihha (Ehr.) 
Kutz; Epithemia gihha var. parallela Grim.; Epithemia zeht'a Ehr., 
Kutz; Epithemia gihherula (Ehr.), Kutz var. producta Grim.; Epithemia 
oonstricta Breb; Encyonema ventricosum 'Kutz; Q-omphonema clavatum 
Ehr.; Fragillaria virescens, Ralfs, ; Eavicula major Kutz; Navicula viridis 
Kutz,* Navicula rostrata Ehr, forma minor; Navicula hohemioa Ehr.; 
Navicula elliptica var. minutissum Grim.; Navicula decurrens; Navicula 
varians Greg.; Navicula hrehisonii Kutz; Navicula forma Kutz; Nitzchia 
hrehissonia Wsm. ; Nitzschia spectahilis (Ehr.), Ralfs.; Surrirella geroltii 
var.” 
See Title No. 6. 
