668 W. T. LEE STRATIGRAPHY OF COAL FIELDS OF NEW MEXICO 



No. Date. 



The coal beds at the base of Placer Mountain (the Mesaverde 

 near Madrid) are referred to "Middle Cretaceous," and the 

 bituminous coal is described as changed to anthracite by igneous 

 intrusion. 



(Pp. 67-71) In northern New Mexico (north of Jemez Moun- 

 tains) the three subdivisions of the Cretaceous were recognized 

 and traced westward through southwestern Colorado. The 

 rocks near Sierra del Navajo (near the Colorado-New Mexico 

 line) are described as "Middle" and "Upper Cretaceous." (The 

 Mesaverde, Lewis, and "Laramie" formations of later writers.) 



(P. 117) The "Brown sandstones and beds of lignite" near 

 Nacimiento are referred to "Middle Cretaceous." (These are 



clearly the Mesaverde rocks of later writers.) 



45. 1877. Cope, E. D. : Report on the extinct Vertebrata obtained in New 



Mexico by parties of the expedition of 1874. 



United States geographical surveys west of the 100th merid- 

 ian, Wheeler in charge, Reports, vol. 4, paleontology, 370 pages, 

 plates 22-83, 4°. Washington, 1877. 



Abstract, Am. Jour. Sci., 3d series, vol. 15, p. 56 (% p.). 1878. 



(Pp. 1-13) The Cretaceous west of Nacimiento and Gallinas 

 Mountains is described and a cross-section given showing coal 

 in "Cretaceous No. 3" (probably the Mesaverde), succeeded 

 after a covered interval by Puerco. 



(Pp. 13-25) The relations of the Eocene to the Cretaceous 

 are discussed at some length. 



46. 1877. Hayden, F. V. : United States geological and geographical surveys 



of the Territories ; geological and geographical atlas of Colo- 

 rado and portions of adjacent territory, by F. Y. Hay den, folio 

 22, double folio atlas sheets, 35 by 22% inches. Washington, 

 1877 (second edition 1881). 



Detailed geologic sheets, by Endlich, W. H. Holmes, Peale, 

 Marvine, and C. A. White. 



The Cretaceous and younger formations mapped in north- 

 western New Mexico are Dakota, Colorado (including Benton 

 and Niobrara), Fox Hills (including Fox Hills proper and 

 Pierre), Laramie, and Wasatch. 



The marine shale (apparently both Mancos and Lewis), in 

 northern New Mexico west of the Rocky INIountains, is mapped 

 as Colorado shale. The coal-bearing rocks (apparently includ- 

 ing both Mesaverde and "Laramie" and probably including also 

 some of the Tertiary) are mapped as Fox Hills. The Wasatch 

 is mapped as resting on the Fox Hills at the eastern margin of 

 the San Juan Basin and on the Laramie farther to the west 

 near Durango and elsewhere. 



47. 1877. Macfarlane, James : Coal regions of America, their topography, 



geology, and development, xvi, 676 pages, 25 maps. New York, 

 1783, 2d edition ; New York, 3d edition, xvi, 700 pages, maps, 

 plates. New York, 1877. 



