I '^8 The America?i Geologist. March, i898 
37- The Norian of the northwest, N. H. Winchell. Bull. 8, Geol. 
and Nat. Hist. Survey of Minn., 1893, pp. i-xxxiv. 
38. The anorthosytes of the Minnesota coast of lake Superior, A. C. 
Lawson. Ibid., pp. 1-23. 
39. Laccolitic sills of the northwest coast of lake Superior, A. C. 
Lawson. Ibid., pp. 24-48. 
40. ,The eruptive and sedimentary rocks on Pigeon point< Minne- 
sota, and their contact phenomena, W. S. Bayley. Bull. 109, U. S. 
Geol. Survey, with maps and plates, Washington, 1893. 
41. The basic massive rocks of the lake Superior region, W. S. 
Bayley. Jour, of Geology, vol. I, 1893, pp. 433-456, 587-596, 688-716; 
vol. II, 1894, pp. 814-825; vol. Ill, 1895, pp. 1-20. 
42. Preliminary report of field work in 1893, U. S. Grant. 22nd 
Ann. Rept. Geol. and Nat. Hist. Survey of Minn., 1894, pp. 76 and 77. 
43. Preliminary report of field work in 1893, A. H. Elftman. Ibid., 
pp. 169-180. 
44. Note on the Keweenawan rocks of Grand Portage island, north 
coast of lake Superior, U. S. Grant. Amer. Geo!., vol. XII, pp. 
437-438, 1894. 
45. Notes upon the bedded and banded structures of the gabbro and 
upon an area of troctolyte, A. H. Elftman. 23rd Ann. Rept. Geol. and 
Nat. Hist. Survey of Minn., 1895, pp. 224-230. 
46. A rational view of the Keweenawan, N. H. Winchell. Amer. 
Geol., vol. XVI, 189s, pp. 150-155. See also the series of articles 
"Crucial Points in the geology of the lake Superior region," Amer. 
Geol., 1895, vols. XV and XVI. 
47. Reviews of pre-Cambrian literature, C. R. Van Hise. Jour, of 
Geol., vol. I. 1893, pp. 309-314; vol. Ill, 1895, pp. 710-721; vol. IV, 1896, 
pp. 750-756. 
48. Some new features in the geology of northeastern Minnesota, N, 
H. Winchell. Amer. Geol., vol. XX, 1897, pp. 50, 51. 
4Q. Volcanic ash from the north shore of lake Superior, N. H. Win- 
chell andU. S. Grant. Amer. Geol., vol. XVIII, pp. 211-213, 1896. 
REVIEW OF RECENT GEOLOGICAL 
LITERATURE. 
PalcEontologiska notiser. Af Gerhard Holm. (Geol. Foren. i. 
Stockholm Forhandl., Bd. 19, Hft. 6, tabl. 8-9, s. 457-482, Nov. 1897.) 
4. Om Bohemilla ( ?) denticulata Linrs. och Retnopleurides micro- 
phthalmus Linrs. Tafl. 8. 
5. Om skalspetsen hos Lituites. Tafl. 9. 
6. Om forekomsten af en Pterygotus i Da la rues Ofersiher. 
In the first of these three notes, Dr. Holm revises the description of 
