Browse Items (1651 total)

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Hand Sample: Porphyritic medium-grained phenocrysts of potassium feldspar in a dark purple-red groundmass. Weathers to white and orange-brown.

Quartz and feldpsar grains are closely interlocked and grains appear to be shattered

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Gray, medium to coarse grained quartz-rich lithic sandstone with rip up clasts and mud rich areas present. Thin Section Fine, (.7-.1 mm) sub angular crystal fragments floating in mud matrix, with feldspar, quartz, and pyroxene present.

Sandstone with ripple marks and cross bedding and strong flute casts along surface indicating mid-high energy. Poorly sorted coarse sandstone with ripple marks, cross bedding and strong flute casts, as well as small pebbles that vary from angular to…

Ichnogenus:

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aluminous

thin oxide crust

bedded, coarse

Show muscovite psuedomorphs and large staurolite crystals

Kingdom: Animalia Phylum: Hemichordata Class: Polychaeta Order: Family: Genus: Species:

Hand Sample: Microcrystalline vesicular, dark-gray to black scoria. Vesicle size varies throughout the sample, ranging from larger circular vesicles with a diameter of approx. 1.5 cm on one surface and small vesicles (less than 0.1cm in diameter) on…