92 
550 Todd (James E.). A preliminary report on the geology of South 
Dakota. 
South Dakota Geol. Surv., Bull. No. 1, pp. 1-172, pis. i-v, figs. 1-2. 
Describes the topographic and geologic features of the State, dis- 
cusses the origin and distribution of rocks of Archean age, and 
describes the lithologic character and distribution of the sedimentary 
and eruptive rocks, and gives an account of the economic resources. 
Includes a preliminary geologic map of South Dakota and a table 
showing the geologic formations occurring in the State. 
5G0 Preliminary report of a reconnoissance in northwestern Min- 
nesota in 1892. 
Minn. Geol. and Nat. Hist. Surv., 21st Ann. Kept., pp. 68-78. 
Describes the route traversed and the glacial phenomena of the 
region. 
560a Preliminary report of a reconnoissance in northwestern Min- 
nesota during 1893. 
Minn. Geol. and Nat. Hist. Surv., 22d Ann. Rept., pp. 90-96. 
Describes the character of the country traversed and the glacial 
deposits. 
561 Pleistocene problems in Missouri. 
Geol. Soc. Am., Bull., vol. v, pp. 531-548. 
Abstracts: Am. Geol., vol. xiii, pp. 216-217 (> r p.); Am. Nat., vol. 
xxviii, p. 1027 (ip.)- 
Describes the bowldery drift and loess of the pre-Glacial formations 
of Missouri, and discusses the subglacial lacustrine and fluviatile 
hypotheses as to the origin of the Pleistocene formations. 
502 Turner (Henry W.). Jackson folio. California. 
U. S. Geol. Surv., Geologic Atlas of the United States, folio 11. 
Describes the relations of land and water, and the dynamic move- 
ments atfecting the Gold Belt of California in Paleozoic, Mesozoic, and 
Cenozoic times, and gives a generalized section of the strata. De- 
scribes the topography of the Jackson sheet and the character and 
distribution of the Auriferous slates, igneous rocks, the Tertiary rocks, 
including the Neocene auriferous gravels, and the Pleistocene beds. 
Describes the occurrence of the gold-quartz veins, gold-bearing grav- 
eis, copper, iron, coal, and building stones. Includes topographic, 
colored areal geologic, economic geologic, and structure section maj>s. 
503 The rocks of the Sierra Nevada. 
U. S. Geol. Surv., 14th Ann. Rept., pt. 2, pp. 435-495, pis. xlviii-lix, 
figs. 49-51. 
Describes the several divisions of the Auriferous slate series and 
the overlying Chico, Tejon, lone, Neocene, and Pleistocene deposits, 
Describes the character and occurrence of the intrusive and extrusive 
igneous rocks. 
504 Geological notes on the Sierra Nevada. 
Am. Geol., vol. xiii, pp. 228-249 and 297-316. 
Describes the characteristics of each of the sedimentary formations 
recognized in the Sierra Nevada, ranging in age from the Silurian to 
Pleistocene. In the second part the author describes the occurrence 
and structure of the intrusive and extrusive igneous rocks. 
