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100   $a20160829d1991      uy              
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200 10$aShelf Carbonates of the Paradox Basin San Juan River Field Trip: Bluff to Lake Powell, Utah, July 3-9, 1989, Field Trip Guidebook T124
210 31$a[Place of publication not identified]$cAmerican Geophysical Union$d1991
215   $a1 online resource (312 pages)
300   $aBibliographic Level Mode of Issuance: Monograph
311   $a0-87590-565-X 
330   $aThe San Juan River has carved majestic canyons through a thick sequence of marine sedimentary rocks of Pennsylvanian (Upper Carboniferous) age in southeastern Utah. The superimposed canyons were cut across the huge Monument Upwarp in late Tertiary to Recent times, exposing a natural cross section of the cyclic strata, including algal bioherms, in unexcelled magnificence. Deepest and oldest rocks exposed are evaporites and carbonates of the Paradox Formation (Middle Pennsylvanian) along the southwestern shelf of the Paradox evaporite basin. The Paradox is a pull-apart basin that sagged into existence during the Ancestral Rockies orogeny, the American counterpart of the Hercynian orogeny of Eurasia. Upper canyon walls are composed of carbonate and clastic cycles of the Late Pennsylvanian Honaker Trail Formation.
606   $aCarbonate rocks
615  0$aCarbonate rocks.
676   $a552.5
700   $aBaars$0875925
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912   $a996214746303316
996   $aShelf Carbonates of the Paradox Basin San Juan River Field Trip: Bluff to Lake Powell, Utah, July 3-9, 1989, Field Trip Guidebook T124$91956106
997   $aUNISA