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San Rafael Group

Commonly cross-bedded, ledge-forming sandstone and slope-forming siltstone. Rock typically has a striped red and white aspect. The Carmel Formation and Entrada Sandstone are prominent members of this group. (Late to Middle Jurassic, about 160-180 Ma)
StateArizona
NameSan Rafael Group
Geologic ageMiddle to Late Jurassic
Original map labelJs
Primary rock typesandstone
Secondary rock typesiltstone
Other rock typesbentonite; mudstone; conglomerate; limestone; dolostone (dolomite); orthoquartzite; gypsum
Lithologic constituents
Major
Sedimentary > Clastic > Siltstone (Bed)
Sedimentary > Clastic > Sandstone (Bed)
Minor
Sedimentary > Clastic > Sandstone > Arenite (Bed)
Sedimentary > Clastic > Mudstone > Claystone > Bentonite (Bed)
Sedimentary > Clastic > Mudstone (Bed)
Incidental
Sedimentary > Clastic > Mudstone (Calcareous)
Sedimentary > Carbonate > Dolostone (Bed)
Sedimentary > Clastic > Conglomerate (Bed)
Sedimentary > Chemical > Evaporite > Gypsum (Bed)
Map references
Richard, S. M., Reynolds, S.J., Spencer, J. E., and Pearthree, P. A., 2000, Geologic Map of Arizona: Arizona Geological Survey Map 35, 1 sheet, scale 1:1,000,000.
Unit references
Richard, S. M., Reynolds, S.J., Spencer, J. E., and Pearthree, P. A., 2000, Geologic Map of Arizona: Arizona Geological Survey Map 35, 1 sheet, scale 1:1,000,000.
Blakey, R.C., 1989, Triassic and Jurassic geology of the southern Colorado Plateau, in Jenney, J.P., and Reynolds, S.J., editors, Geologic evolution of Arizona: Arizona Geological Society Digest 17, p. 369-396.
Geographic coverageApache - Coconino - Navajo

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URL: http://mrdata.usgs.gov/geology/state/sgmc-unit.php?unit=AZJs;0
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