. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. 600 REPORT OF NATIONAL MUSEUM, 1904. During the years 1871 to 1876 work under essentially the same con- ditions was continued by the Hayden survey throughout Colorado, the appropriations being $75,000 annually, with the exception of 1876, when they dropped to $65,000. The individual work of Hayden him- self becomes gradually less conspicuous in the reports issued, owing to the increased amount of administrative work. In 1874 the party under
. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. 600 REPORT OF NATIONAL MUSEUM, 1904. During the years 1871 to 1876 work under essentially the same con- ditions was continued by the Hayden survey throughout Colorado, the appropriations being $75,000 annually, with the exception of 1876, when they dropped to $65,000. The individual work of Hayden him- self becomes gradually less conspicuous in the reports issued, owing to the increased amount of administrative work. In 1874 the party under direction of A. K. Marvine was engaged in the southern portion of North Park; that under Dr. A. C. Peale in the region bounded on the north by the Eagle and Grand rivers, on the east by the one hundred and seventh meridian, on the west by the State line, and on the south by latitude 38° 20'. The third division under A. D. Wilson, with F. M. Endlich, geologist, was assigned to what is known as the San Juan district, and the fourth, under the immediate direction of H. Holmes as artist and geologist, to the. Albert Charles Peale. Doctor Hayden, with- \X Elk Mountain region. In the report for 1871 Hayden devoted considerable attention to the stratigraphic position of the Lignite group, a discussion of which may be referred to later. Perhaps the most striking feature brought out in the work of this year was that relative to the Elk Mountains. This range was regarded by Hayden as a grand illustration of an eruptive range, "the immense faults, complete overturning of thousands of feet of strata, and the great number of peaks, all composed of eruptive ; indicating to him periods of violent and catastrophic action. The great thick- ness of sedimentary strata which had been carried to the loftiest points of the axial ridge in a nearly horizontal position he thought might be explained on the suppo- sition that at one-time the sedimentary mass rested on a floor of pasty o
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