78 BIBLIOGRAPHY OF NORTH AMERICAN GEOLOGY, [bull. 271 
Lambert (Avery E.). 
1. Description of Dalmanites lunatus. 
Geol. Soc. Am., Bull., vol. 15, pp. 480-482, 1 pi., 1904. 
Lane (Alfred C). 
1. The theory of copper deposition. 
Mich. Miner, vol. 6, no. 2, pp. 9-11, no. 3, pp. 9-11, 1904. Am. Geol., vol. 34 
pp. 297-309, 1 fig., 1904. 
Discusses the theory of copper deposition with especial reference to the coppei 
ore deposits of the Lake Superior region. 
2. The science of raw materials. 
Mich. Miner, vol. 6, no. 4, pp. 9-11, 1904. 
Discusses scope and utility of economic geology. 
3. Building and road materials. 
Mich. Miner, vol. 6, no. 5, pp. 9-12, no. 6, pp. 9-11, 1904. 
Gives notes on the occurrence, character, and use of materials for Portland 
cement and cement brick manufacture, and road making. 
4. Recent explorations for oil and gas. Advance sheets from th 
Annual Report of State geologist, 1904 [Michigan]. 
Mich. Miner, vol. 6, no. 8, pp. 9-12, no. 9, pp. 9-13, 1904. 
Includes records of borings and discussion of the strata passed through. 
5. The role of possible eutectics in rock magmas. 
Tour. Geol., vol. 12, pp. 83-93, 1 fig., 1904. 
Discusses the quantitative classification of igneous rocks. 
6. Magnetic phenomena around deep borings. 
Mich. Acad. Sci., 4th Rept, pp. 166-167, 1904. 
7. Our underground wealth. Michigan clay, shales, and pavin; 
materials. 
The Gateway, vol. 1, no. 6, pp. 49-51, 1904. 
Discusses the occurrence and utilization of clays and shales for paving materia 
8. Gold near Lake Superior. 
The Gateway, vol. 3, no. 3, pp. 30-32, 1904. 
Gives observations upon the geology along the international boundary and tt 
occurrence and mining of gold ores in Ontario and Michigan. 
i>. Historical review of the geology of Michigan. 
Mich. Acad. Sci., 5th Ann. Rept., pp. 184-195, 1904. 
Gives a review of the investigations upon the geology of Michigan, a genen I 
outline of the geological structure and stratigraphy of the state, and a list < | 
publications bearing upon the geology of the state. 
Lasswitz (Rudolf). 
1. Die Kreide-Ammoniten von Texas. (Collectio F. Roemer.) 
Geol. und Pal. Abh. (Koken), N. F., Bd. 6, Heft 4, 40 pp., 8 pis., 1904. 
Gives systematic descriptions of Cretaceous ammonites from Texas, a graph 
section of strata at Austin, and correlation tables of Cretaceous formations. 
