100 BIBLIOGRAPHY AND INDEX OF N. A. GEOLOGY, [bull. 135. 
G17c Weed (Walter Harvey) and Iddings (J. P.). Livingston folio. 
Montana. 
U. S. Geol. Surv., Geologic Atlas of the United States, folio 1. 
See Iddings (J. P.) and Weed (W. H.), No. 307. 
618 Weeks (Joseph D.). The Potomac and Boaring Greek coal fields 
in West Virginia. 
U. S. Geol. Surv., 14th Ann. Rept., pt. 2, pp. 567-590, pis. lxxiii-lxxiv, 
figs. 73-75. 
Describes the location of the coal basins, gives the sections displayed 
at various points and chemical analyses of the coals. 
018ft Wells (H. L.),Pirsson (L. V.) and. On the occurrence of lead- 
hillite in Missouri, and its chemical composition. 
Am. Jour. Sci., 3d ser., vol. xlviii, pp. 219-226. 
See Pirsson (L. V.) and Wells (H. L.), No. 457. 
619 Westgate (Lewis G.). The mineralogical character of certain 
New Jersey limestones. 
Am. Geol., vol. xiv, pp. 308-313. 
Gives a chemical analysis of the limestone and describes the char- 
acters of pyroxene and biotite and the microscopic characters of the 
two special types of the rock, pyroxene rock and quartz rock. 
620 The age of the crystalline limestones of Warren County, N. J. 
Am. Geol., vol. xiv, pp. 369-379, with map. 
Describes the petrographic characters of these limestones and their 
relationship with other crystalline limestones of the State, and reviews 
the opinions of other writers as to their age. Describes the relations 
of the limestones with the gneisses and eruptive rocks, and concludes 
that the limestones of this region are older than the blue magnesian 
limestone of Cambrian age. 
621 Weston (T. C). Notes on the " Quebec group." 
Ottawa Nat., vol. viii, pp. 81-82. 
Describes an exposure of these beds near Quebec. 
622 Notes on the Miocene Tertiary rocks of the Cypress Hills, 
Northwest Territory, Canada. 
Nova Scotian Inst. Sci., Proc. and Trans., 2d ser., vol. i, pp. 223-227. 
Gives a section of the Miocene beds in this region and notes on the 
fossils found in them. 
623 Wheeler (H. A.). The calculation of the fusibility of clays. 
Eng. and Mg. Jour., vol. Ivii, pp. 224-225 and 244. 
Gives in tabular form the chemical analyses and fusibility of clays 
from different parts of Missouri, and discusses the results obtained. 
621 White (Charles A.). The relation of biology to geological investi- 
gation. 
U. S. Nat. Mus., Ann. Kept., 1892, pp. 245-368. 
Describes the character and limitations of sedimentary formations 
and discusses the character, origin, and relation of fossil remains to 
structural geology, the chronological value of fossils, and the criteria 
of past aqueous conditions. 
