60 
428 Lakes (Arthur). Iron and manganese. The great Cebolla Kiver 
deposits [Colorado]. 
Colliery Eng\ vol. xvi, pp. 267-268, 1896. 
Describes the occurrence of the ore bodies and discusses their origin. 
429 Pikes Peak [Colorado]. 
Colliery Eng., vol. xvii, pp. 59-60, 1896. 
Describes the character of the Pikes Peak granite and its disinte- 
gration. 
430 The Cripple Creek region. Epitome of the U. S. Geological 
Survey's report on the Cripple Creek mining region [Colo- 
rado]. 
Colliery Eng.. vol. xvii, pp. 105-110, 1896. 
Gives a resume" of this report. 
431 Summit district gold regions. An epitome of a description of 
the ore deposits of Summit district, Rio Grande County, 
Colorado, by E. C. Hills. 
Colliery Eng., vol. xvii, pp. 164-165, 1896. 
Describes the occurrence and character of the gold ores. 
432 The San Juan region [Colorado]. 
Colliery Eng., vol. xvii, pp. 206-209, 1896. 
Describes the topographic and geologic features of the region. • 
433 Victor (Cripple Creek), Colorado. 
Colliery Eng., vol. xvii, pp. 210-211, 1896. 
Describes the occurrence of gold at this locality. 
434 Lambe (Lawrence M.). Description of a supposed new genus of 
Polyzoa from the Trenton limestone at Ottawa [Ontario]. 
Can. Rec. Sci., vol. vii, pp. 1-3, pi. 1, 1896. 
Describes Astroporites ottawaensis n. sp. 
435 Lane (Alfred C). The geology of Lower Michigan, with reference 
to deep borings. Edited from notes of C. E. Wright, late 
State geologist. 
Mich. Geol. Surv., vol. v., Pt. II, pp. 1-100, pis. i-lxxiii, and map of 
Lower Michigan, 1895. 
Describes the character of the Silurian, Devonian, and Carboniferous 
formations as shown by a large number of artesian borings. Describes 
the occurrence of coal, gypsum, natural gas, and petroleum. 
436 Langdon (Daniel W.). The Loop Creek, West Virginia, coal field. 
Colliery Eng., vol. xvi, p. 122, 1896. 
Gives a section of the strata and a chemical analysis of the coal. 
437 Lawson (Andrew C). On malignite — a family of basic plutonic 
orthoclase rocks rich in the alkalies and lime, intrusive in 
the Coutchiching schists of Poohbah Lake [Ontario]. 
Univ. of Cat., Dept. of Geol., Bull., vol. ii, pp. 337-362, pi. 18, 1896. 
Describes the field relations of the rocks occurring in the Province of 
Ontario and their petrographic characteristics. 
