Browse Items (1651 total)

Hand Sample:

Composed entirely of Ilmenite.

Recently exhumed ijolite from shallow bulldozer cut.

Hand Sample: Shows traces of iron oxidation in isolated areas. Small (> 0.5 mm in diameter) nodules, with the appearance of small sand grains appear in clusters on one face of the rock (not…

White Carbonatite. Found on Southwest side of the main rock unit body on North side of Beaver Creek about 1/4 mi.

Nepheline Syenite. Thin, dark vein runs through the center body of the rock.

Nepheline syenite that outcrops on west side of trail at about 9200 ft. on east side line of section.

Fenitized Gneiss. Gneiss discovered in direct contact with pyroxenite in prospect trench on ridge, about 500 ft. west of PH-1.. .

Coarse pyroxenite, with traces of nepheline. This is the freshest pyroxenite that was found. It occurs near the nepheline syenite body in the eastern part of the complex.

OCR PDF of supplemental information for the Northern Apennines Ophiolites collection.

OCR PDF of supplemental information for the Powderhorn Carbonatite collection.

A light tan limestone with weathered surfaces

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

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.

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.

A buff-colored siltstone/sandstone. The grains are angular and are quartz-dominated.

Thin section images were taken at a 400x magnification.

A ferruginous sample.

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

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.

A classic red-bed sample typical of the sandstones from the Supai Formation.

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

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…

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…

Fine-grained limestone with occasional fossil remains.

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

Oblitic and Crinoidal Lithology.

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