Forest physiography; physiography of the United States and principles of soils in relation to forestry . of glacial deposits locallyabout its border are still later occurrences of physiographic importance. 1 Emmons, Cross, and Eldridge, Geology of the Denver Basin in Colorado, Mon. U. S. No. 27, 1896, p. 4. - A. C. Peale, U. S. Geol. and Geog. Surv. of Col. and Adj. Terr. (Hayden Surveys), 1873,p. 212. 3 F. M. Endlich, U. S. Geol. and Geog. Surv. of Col. and Adj. Terr. (Hayden Survej^s),1873, pp. 334, 339- 384 FOREST PHYSIOGRAPHY San Luis Valley appears nearly level over great areas
Forest physiography; physiography of the United States and principles of soils in relation to forestry . of glacial deposits locallyabout its border are still later occurrences of physiographic importance. 1 Emmons, Cross, and Eldridge, Geology of the Denver Basin in Colorado, Mon. U. S. No. 27, 1896, p. 4. - A. C. Peale, U. S. Geol. and Geog. Surv. of Col. and Adj. Terr. (Hayden Surveys), 1873,p. 212. 3 F. M. Endlich, U. S. Geol. and Geog. Surv. of Col. and Adj. Terr. (Hayden Survej^s),1873, pp. 334, 339- 384 FOREST PHYSIOGRAPHY San Luis Valley appears nearly level over great areas but in fact itdeparts from the horizontal by important amounts. The marginalslopes descend by regular gradients to an axial depression located welltoward the eastern margin of the valley; they are developed upon aseries of coalescing alluvial fans and the longest and flattest slopes arethose built by the largest streams; the Rio Grande has built an alluvialfan so large as to throw the axis of the valley to one side (east) of thecenter of the depression.^ The eastern side of the basin is bordered by. Fig. 132.—Looking eastward from Hunt Springs across the north end of San Luis Valley; San LuisCreek in the middle distance, Sangre de Cristo Range in the background. (Siebenthal, U. S. Geol. Surv.) the Sangre de Cristo Range, on whose flanks a great alluvial plain hasbeen formed whose deposits above an elevation of 9000 to 9500 feetconsist of fluvio-glacial debris formed in connection with Pleistoceneglaciers. Concentric terminal moraines surmount the crests of thealluvial fans and cones, Fig. 131.^ 1 C. E. Siebenthal, Geology and Water Resources of the San Luis Valley, Col., Water-Supply Paper U. S. GeoL Surv. No. 240, 1910, p. 10. 2 C. E. Siebenthal, Notes on Glaciation in the Sangre de Cristo Range, Colorado, !., vol. 15, 1907, p. 15. Idem, The San Luis Valley, Colorado, Science, n. s., vol. 31, 1910,p. 746. ROCKY- MOUNTAINS. Ill 385 Northeastward from Antonito there s
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