The Eastern San Juan Mountains: Their Geology, Ecology and by Rob Blair, George Bracksieck

By Rob Blair, George Bracksieck

A spouse to The Western San Juan Mountains (originally released in 1996), The jap San Juan Mountains info the actual atmosphere, organic groups, human background, and attractions during this wealthy and numerous mountain system.A typical department among the jap and western slopes of the San Juans is the north-south line that runs nearly via Lake urban, south of the crossing of the Piedra River through US street a hundred and sixty. during this tremendous guidebook, twenty-seven contributors--all specialists of their fields--artfully carry the geology, hydrology, animal and flowers, human histories, and go back and forth routes of those jap slopes to existence. Designed to notify researchers, educators, and scholars in regards to the region's advanced platforms, The japanese San Juan Mountains additionally serves as an informative guidebook to accompany viewers alongside their travels at the Silver Thread nationwide Scenic Byway, which stretches among South Fork and Lake urban. The japanese San Juan Mountains merits a spot subsequent to The Western San Juan Mountains at the bookshelf of each naturalist, researcher, resident, educator, pupil, and vacationer looking a better realizing of this significant position and its background.

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Additional resources for The Eastern San Juan Mountains: Their Geology, Ecology and Human History

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1). Until recently, a widespread ignimbrite sheet in the southeastern San Juans was mapped as part of the Masonic Park Tuff (Steven and Lipman 1976). 4 Ma (Lipman et al. 1996). The Mount Hope area was formerly interpreted as a caldera source for the Masonic Park Tuff by Steven and Lipman (1976), based on multiple criteria that remain partly valid as indicators of eruptive proximity, but the existence of any Mount Hope Caldera now appears unlikely (Lipman, Dungan, and Bachman 1997). The thick “Fish Canyon Tuff ” in the Mount Hope area, previously interpreted as a massive tuff that ponded within a preexisting Mount Hope caldera (Steven and Lipman 1976), is now recognized as a large lava-like mass of Pagosa Peak Dacite, a precursor to eruption of the overlying Fish Canyon Tuff (see discussion in the next section).

M. A. Dungan, and O. Bachman. 1997. Eruption of Granophyric Granite from a Large Ash-Flow Magma Chamber: Implications for Emplacement of the Fish Canyon Tuff and Collapse of the La Garita Caldera, San Juan Mountains, Colorado. Geology 25:915–918. Lipman, P. , M. A. Dungan, L. D. Brown, and A. Deino. 1996. Recurrent Eruption and Subsidence at the Platoro Caldera Complex, Southeastern San Juan Volcanic Field, Colorado: New Tales from Old Tuffs. Geological Society of America Bulletin 108: 1039–1055.

Incremental Assembly and Prolonged Consolidation of Cordilleran Magma Chambers: Evidence from the Southern Rocky Mountain Volcanic Field. Geosphere 3:42–70. Lipman, P. , B. Doe, and C. Hedge. 1978. Petrologic Evolution of the San Juan Volcanic Field, Southwestern Colorado: Pb and Sr Isotope Evidence. Geological Society of America Bulletin 89:59–82. Lipman, P. , M. A. Dungan, and O. Bachman. 1997. Eruption of Granophyric Granite from a Large Ash-Flow Magma Chamber: Implications for Emplacement of the Fish Canyon Tuff and Collapse of the La Garita Caldera, San Juan Mountains, Colorado.

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