weeks.] PALEONTOLOGY, PETROLOGY, AND MINERALOGY, 1896. 47 
301a Hayes (Charles Willard). The Tennessee phosphates. 
U. S. Geo]. Surv., 17th Ann. Rept,, Pt. II, 38 pp., pis. 1-1 v, tig. 44, 1896. 
Describes the general physiographic and stratigraphic features of the 
region and the character and distribution of the black and white phos- 
phates. Discusses their origin. 
.302 The white phosphates of Tennessee. 
Am. Inst. Mg. Engrs., Trans., vol. xxv, pp. 19-28, 1896. 
Describes the location, occurrence, and physical and chemical charac- 
ter of the phosphate deposits, and discusses their origin. 
303 Helmhacker (E.) Sepiolite. 
Eng. and Mg. Jour., vol. lxii, pp. 80-82, 1896. 
Describes the characteristics of the mineral and its occurrence in 
different countries. 
304 Henrich (Carl). The Ducktown ore deposits and the treatment 
of the J) nek town copper ores [Tennessee]. 
' Am. Inst, Mg. Engrs., Trans., vol. xxv, pp. 173-245, tigs. 1-22, 1896. 
Gives a historical sketch of mining in this region, describes the 
geologic structure of the ore deposits and the physical and chemical 
characters of the copper ores, and discusses the genesis of the ore 
deposits. The paper contains a sketch map and cross sections of the 
ore deposits. 
305 Faulting and accompanying features observed in glacial 
gravel and sand in southern Michigan. 
Am. Inst. Mg. Engrs., Trans., vol. xxvi, pp. 460-464, tig. 1, 1896. 
Describes the character of the strata and the faulting which has 
taken place in these Glacial deposits. 
306 Herbertson (Andrew J.). The history of the Great Lakes and 
Niagara. 
Sci. Amer. Suppl., vol. xlii, p. 17398, 1896. 
Reviews the geologic history of the Great Lakes region. 
307 Herrick (C. L.). The so-called socorro tripoli. 
Am. Geol., vol. xviii, pp. 135-140, pis. iv-v, 1896. 
Describes the occurrence in Newton County, Mo., gives a chemical 
analysis of the material and discusses its origin. 
308 Hershey (Oscar H.). The Silveria formation (Illinois). 
Am. Jour. Sci., 4th ser., vol. ii, pp. 324-330, 1896. 
Describes the lithologic character, occurrence, and the fossil flora, 
gives a section of the formation and discusses the evidence of the age 
of the formation. 
309 Ancient river deposits of the Spring River valley in Kansas. 
Am. Geol., vol. xvii, pp. 37-40, 1896. 
Describes the author's observations in southeastern Kansas and dis- 
cusses the geologic history of the region. 
310 Early Pleistocene deposits of northern Illinois. 
Am. Geol., vol. xvii, pp. 287-303, 1896. 
Describes Glacial deposits in the valley of Yellow Creek and discusses 
their evidence as to the early Pleistocene history of the region. 
