weeks] PALEONTOLOGY, PETROLOGY, AND MINERALOGY, 1898. 97 
852 Watson (Thomas L.). A preliminary petrographic report on nieta- 
inorpliic rocks in and around Dahlonega, Lumpkin County, 
Georgia. 
Ga. Geol. Surv., Bull. No. 4-A, pp. 320-330, 1898. 
Describes the schists and basic rocks of the region. 
853 Weathering of diabase near Chatham, Virginia. 
Am. Geol., vol. xxii, pp. 85-101, 1898. 
Describes the petrographic character of the rock, gives chemical 
analyses of the fresh and weathered material, and discusses the process 
of decay in the rock weathering. 
854 Weed (Walter Harvey). See Diller (J. S.), No. 234. 
855 and Pirsson (Louis Valentine). Geology and mineral resources 
of the Judith Mountains of Montana. 
U. S. Geol. Surv., 18th Ann. Rept., Pt. Ill, pp. 446-616, pis. lxi-lxxxvi 
tigs. 32-54, 1898. 
Describes the physiography, geologic history,occurrence,and character 
of the Paleozoic and Mesozoic rocks, the detailed geology, character, 
and occurrence of the igneous rocks, the dynamic and structural geology 
and the mineral resources of the region. 
856 — Geology of the Castle Mountain mining district, Mon- 
tana. 
Review, Zeit. fur. prak. Geol., 1898, heft 9, pp. 330-331, 1898. 
See Bibliography and Index for 1896, No. 723. 
857 Weeks (Fred Bough ton). Bibliography and index of North Ameri- 
can geology, paleontology, petrology, and mineralogy for 
1897. 
U. S. Geol. Surv., Bull. No. 156, 130 pp., 1898. 
Contains list of titles of papers arranged alphabetically by authors' 
names and a subject index. 
857a Weidman (Samuel). A contribution to the geology of the pre- 
Cambrian igneous rocks of the Fox River Valley, Wisconsin. 
Wis. Geol. and Nat. Hist. Surv. Bull. No. Ill, Sci. Ser., No. 2, pp. 1-63, 
pis. i-x, figs. 1-13, 1898. 
Describes the geologic features of the region and the petrographic 
characters of the igneous rocks. Includes a geologic map. 
858 See Diller (J. S.), No. 234. 
859 Weller (Stuart). A bibliographic index of North American Car- 
bonilerous invertebrates. 
U. S. Geol. Surv., Bull. No. 153, 653 pp., 1898. 
Contains a chronologic catalogue of papers, a list of authors, a sum- 
mary of classes and genera, and an alphabetical list of genera and 
species, with bibliographic references. 
Bull. 162 7 
