Browse Items (1651 total)

http://dl.dropbox.com/u/66399955/GC-9.JPG
A silty-shale where the clasts are dominated by quartz. Sample collected from an area typified by interbedded limestones and shale.

Both thin section images were taken at a 400x magnification.

http://dl.dropbox.com/u/66399955/GC-10.JPG
Oblitic and Crinoidal Lithology.

Both thin section images were taken at a 400x magnification.

http://dl.dropbox.com/u/66399955/GC-11.JPG
Fine-grained limestone with occasional fossil remains.

Both thin section images were taken at a 400x magnification.

http://dl.dropbox.com/u/66399955/GC-12.JPG
Collected from the Redwall Formation, this is a highly silicious sample defined in the suite's documentation as chert, but the sample lacks the nano-crystalline appearance of a traditional chert. It appears to be more of a slightly metamorphosed…

http://dl.dropbox.com/u/66399955/GC-13.JPG
Though listed as a limestone, this sample is best described as a conglomerate with calcite present in the matrix. This sample was collected from a bed of conglomerate lithology just below contact with Supai formation.

Both thin section images…

http://dl.dropbox.com/u/66399955/GC-14.JPG
A classic red-bed sample typical of the sandstones from the Supai Formation.

Both thin section images were taken at a 400x magnification.

http://dl.dropbox.com/u/66399955/GC-15.JPG
Classic red-bed sample from the Supai Formation with silt-sized grains of mostly quartz. Some grains are semi-rounded.

Both thin section images were taken at a 400x magnification.

http://dl.dropbox.com/u/66399955/GC-16.JPG
A ferruginous sample.

Both thin section images were taken at a 400x magnification.

http://dl.dropbox.com/u/66399955/GC-17.JPG
A buff-colored siltstone/sandstone. The grains are angular and are quartz-dominated.

Thin section images were taken at a 400x magnification.

http://dl.dropbox.com/u/66399955/GC-18.JPG
A sample from the gamma member of the Toroweap Formation. It is an orangish-brown sample.
Both thin section images were taken at a 400x magnification.

http://dl.dropbox.com/u/66399955/GC-19.JPG
Sample from the beta member of the Toroweap formation. Sample is light tan-orangish with weathered surfaces.

Both thin section images were taken at a 400x magnification.

http://dl.dropbox.com/u/66399955/GC-20.JPG
A light tan limestone with weathered surfaces

Both thin section images were taken at a 400x magnification.

http://dl.dropbox.com/u/66399955/NAO-11.JPG
Hyaloclastite of basalt with superimposed metamorphism in pumpellyite-prehnite facies.

http://dl.dropbox.com/u/66399955/NAO-10.JPG
Serpentinized peridotite with plagioclase, olivine, plagioclase, clino-pyroxene, chromite. Secondary minerals include hydrogrossuaria as well as serpentine, chlorite, prehnite.

http://dl.dropbox.com/u/66399955/NAO-9.JPG
Peridotite, serpentinized, with plagioclase with harrisitic structure.

http://dl.dropbox.com/u/66399955/NAO-8.JPG
Basalt dike in gabbro with prehnite-pumpellyite overprint.

http://dl.dropbox.com/u/66399955/NAO-7.JPG
Rhodingitized gabbro dike in serpentinite. Chlorite, hydrogrossularia, diopside, prehnite, pumpellyite, vesuviane.

http://dl.dropbox.com/u/66399955/NAO-6.JPG
Tectonic-sedimentary breccia of serpentinite modified by hydrothermal events in oceanic environment.

http://dl.dropbox.com/u/66399955/NAO-5.JPG
Dioritic gabbro with deformational oceanic metamorphism of amphibolitic to greenschist facies and overprinting of prehnite-pumpellite.
Primary phases: plagioclase, clinopyroxene, olivine, ilmenite. Oceanic metamorphic paragenesis: plagioclase,…

http://dl.dropbox.com/u/66399955/NAO-4.JPG
Traces of oceanic metamorphism in greenschist-amphibolitic facies and weak overprint in prehnite-pumpellyite facies.
Metamorphic oceanic paragenesis: dark hornblende, actinolite, chlorite, oligoclase-albite in microfractures or reaction rims on…
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