weeks.] PALEONTOLOGY, PETROLOGY, AND MINERALOGY, 1901. 43 
325 Gregory (Herbert E.). [Review of " Geologv of the Boston basin, 
vol. 1, Part III. The Blue Hills Complex," by W. O. 
Crosby.] 
Am. Jour. Sci., 4th ser., vol. 11, p. 324, 1901. 
326 G-regory (J. W.) The plan of the earth and its causes. 
Am. Geol., vol. 27, pp. 100-119, figs. 1-5, and 134-147, pis. 12-14, figs. 
1-10, 1901. 
Reviews previous discussions as to the origin of the distribution of the 
irregularities in the surface of the lithosphere and discusses the pentago- 
nal theory of Elie de Beaumont and the tetrahedral of Green. 
327 Gresley (W. S.). Possible new coal plants, etc., in coal. 
Am. Geol., vol. 27, pp. 6-14, pis. 2-7, 1901. 
Describes structures occurring in coal beds which may be of vegetable 
origin. 
328 Griffith (William). An investigation of the buried valley of Wyo- 
ming [Pennsylvania]. 
Wyoming Hist, and Geol. Soc, Proc. and Coll., vol. 6, pp. 27-36, 
with map, 1901. 
Abstract: Am. Geol., vol. 28, p. 324, (J p.), 1901. 
Describes glacial phenomena of the region. 
329 Grimsley (G. P.). Kansas mines and minerals. 
Kans. Acad. Sci., Trans., vol. 17, pp. 200-207, 1901. 
Gives an account of the occurrence of the various economic products 
of the State. 
330 Hague (Arnold). Note sur les phenomenes volcaniques Tertiaires 
de la chaine d'Absaroka [Wyoming]. 
Int. Cong. Geol., Compte Rendu, viii session, pp. 364-365, 1901. 
331 Hall (Christopher W.). Sources of the constituents of Minnesota 
soils. 
Minn. Acad. Nat, Sci., Bull. No. 3, pp. 388-406, 2 figs., 1901. 
332 Keweenawan area of eastern Minnesota. 
Geol. Soc. Am., Bull., vol. 12, pp. 313-342, pis. 27-28, figs. 1-3, 1901. 
Describes the topography and physiography, relations, associated for- 
mations, the occurrence of the Keweenawan rocks and the general char- 
acters and petrography of the Chengwatana series. 
333 Keewatin area of eastern and central Minnesota. 
Geol. Soc. Am., Bull., vol. 12, pp. 343-376, pis. 29-32, 1901. 
Describes the occurrence of the series at various localities and their 
megascopic; and microscopic characters. Discusses the evidences as to 
the age of the series. 
334 Hallock (William). Peculiar effects due to a lightning discharge 
on Lake Champlain in August, 1900. 
Jour. Geol., vol. 9, pp. 671-672, 1901. 
Describes the effect upon the rocks struck by the discharge. 
