122 BIBLIOGRAPHY OF NORTH AMERICAN GEOLOGY, 1906-1907. 
Lee, Willis T. 
1539. Gypsum beds and water storage in the Pecos Valley of New Mexico. — 
Abstract : Science, new ser., vol. 23, p. 306, February 23, 1906. 
Describes the geologic structure of the region. 
1540. Geology and water resources of Owens Valley, California. — U. S. Geol. 
Survey, W.-S. and Irrig. Paper no. 181, 28 pp., 6 pis., 1906. 
Describes the geography, the stratigraphy, geologic structure and history of the valley, 
and the underground and surface water conditions. 
1541. Geology of the lower Colorado River. — Geol. Soc. America. Bull., vol. 
17. pp. 275-284, 3 pis., 1906. 
Describes the character of the detrital formations in the valley of the lower Colorado 
River, the physiographic history of the lower part of the Colorado River, and the recent 
geologic history of the area. 
1542. The Engle coal field. New Mexico.— U. S. Geol. Survey, Bull. no. 285, 
p. 240, 1906. 
Describes the occurrence and character of the coal deposits. 
1543. The Cove Creek sulphur beds, Utah. — U. S. Geol. Survey, Bull. no. 315, 
pp. 485-4X9, 1907. 
1544. The Iron County coai field. Utah.— U. S. Geol. Survey, Bull. no. 316, 
pp. 359-375. 1 pi., 1 fig., 1907. 
1545. Water resources of the Rio Grande Valley in New Mexico, and their 
development. — U. S. Geol. Survey, W.-S. and Irr. Paper no. 188, 50 pp., 10 pis., 
2 figs., L907. 
Includes an account of the geography and geology of the valley and of its geologic 
history. 
1546. Note on the red beds of the Rio Grande region in central New Mexico. — 
Jour. Geology, vol. 15, no. 1, pp. 52-58, 1907. 
Describes the occurrence and relations of red beds in central New Mexico of two dif- 
ferent ages, the earlier <>f Carboniferous and the later of upper Cretaceous age. 
1547. Afton craters of southern New Mexico. — Geol. Soc. America, Bull., 
vol. 18, pp. 211-220, 2 pis., 1 fig.. 1907. Abstract: Science, new ser., vol. 25, 
pp. 768-769, May 17, 1907. 
Describes the situation, character, and geologic relations of these depressions and dis- 
cusses the mode of their formation. 
1548. The late history of the lower Colorado River. — Abstract: Science, new 
ser., vol. 25, pp. 390-391, March 8, 1907. 
Presents the succession of geologic events in the region and discusses their correlation 
with those of other regions. 
Lee, Willis T., and Nickles, John M. 
1549. Classified list of papers dealing with coal, coke, lignite, and peat 
contained in the publications of the U. S. Geological Survey. — U. S. Geol. Sur- 
vey, Bull. 316, pp. 518-532, 1907. 
Lees, James H. 
1550. Report of the assistant state geologist. — Iowa Geol. Survey, vol. 17, 
pp. 7-10, 1907. 
Administrative report. 
1551. The skull of PaleorJiinus, a Wyoming phytosaur. — Jour. Geology, vol. 
15, no. 2, pp. 121-151, 8 figs., 1907. 
Leith, Charles Kenneth. 
A summary of Lake Superior geology with special reference to recent studies 
of the iron-bearing series.— Am. Inst. Min. Eng., Trans., vol. 36, pp. 101-153, 
4 figs., 1906 (Bi-Mo. Bull. no. 3, pp. 453-507, 4 figs., 1905).— See Leith, 14, 
page 218 of Bulletin no. 301, U. S. Geol. Survey, 
