48 BIBLIOGRAPHY OF NORTH AMERICAN GEOLOGY, 1906-190*7. 
Clarke, John M. — Continued. 
494. Report of the state geologist and paleontologist [of New York] for 
1905.— New York State Mus., 59th Ann. Rept., vol. 1, pp. 10-^1, 8 pis.. 1906. 
Outlines the work under progress during 1905. Includes various data relating to the 
stratigraphic, surficiai, and economic geology of New York. 
495. What should appear in the report of a state geologist? — Econ. Geology, 
vol. 1, no. 5, pp. 488-489, 1906. 
496. Evidences of a Coblenzian invasion in the Devonic of eastern North 
America. — Festschrift. Adolf v. Koenen, E. Schweizerbartsche Verlagsbuchhand- 
lung, Stuttgart, pp. 359-368, 1907. 
497. Some new Devonic fossils. — New York State Mus., Bull. 107, pp. 153- 
291, illus., 1907. 
Describes invertebrate fossils from lower Devonian deposits of the Province of Quebec, 
New Brunswick, and Maine. 
498. An interesting style of sand-filled vein. — New York State Mus., Bull. 
107, pp. 293-294, 1 pi., 1907. 
499. The Eurypterus shales of the Shawangunk Mountains in eastern New 
York.— New York State Mus., Bull. 107, pp. 295-326, 10 pis., 1907. 
Discusses their correlation and describes their crustacean fauna. 
500. Third report of the director of the Science Division 1906, including 
the 60th report of the State Museum, the 26th report of the state geologist, and 
the report of the state paleontologist for 1906. — (Reprinted from the 60th Ann. 
Rept. N. Y. State Mus.). Albany, 1907, 182 pp., 40 pis. 
Includes various geologic and paleontologic data : Earthquake records, pp. 29-32 ; an 
account of limestone caverns of eastern New York, pp. 32-51 ; Appendix B is a supple- 
ment to the catalogue of type specimens of Paleozoic fossils. 
501. Eurypterus fauna of the Shawangunk grit. — Abstract : Science, new 
ser., vol. 25, pp. 294-295, February 22, 1907. 
502. Lake Champlain. — Abstract : Science, new ser., vol. 26, p. 400, Septem- 
ber 27, 1907. 
Discusses the origin of the Lake Champlain Valley. 
Clarke, John M., and Luther, D. Dana. 
Geology of the Watkins and Elmira quadrangles [New York], accompanied 
by a geologic map. — New York State Mus., 58th Ann. Rept., vol. 3 (Bull. 81, 
1905), pp. 3-29, and geol. map (in pocket), 1906.— See Clarke and Luther, 2, 
page 68 of Bulletin no. 301, U. S. Geol. Survey. 
Geologic map of the Tully quadrangle [New York]. — New York State Mus., 
58th Ann. Rept., vol. 3 (Bull. 82, 1905), pp. 33-52, geol. map (in pocket), 
1906.— See Clarke and Luther, 3, on page 68 of Bulletin no. 301, U. S. Geol. 
Survey. 
Clarke, W. C. 
503. The zinc belt of Claiborne and Union counties, Tennessee. — Mines and 
Minerals, vol. 27, no. 12, p. 567, July, 1907. 
Cleland, H. F. 
504. Restoration of certain Devonian cephalopods with description of new 
species. — Jour. Geology, vol. 15, no. 5, pp. 459-469, 14 figs., 1907. 
505. Some little-known Mexican volcanoes. — Pop. Sci. Monthly, vol. 71, no. 2, 
pp. 179-187, 8 figs., August, 1907. 
Clement, J. K. 
Minerals of the composition MgSi0 3 ; a case of tetramorphism. — See Allen, 
Wright, and Clement, no. 28. 
