Browse Items (1651 total)

Kingdom: Animalia Phylum: Chordata Class: Reptilia Order: Ichthyosauria Family: Genus: Species:

Hypersthene Quartz Diorite from the Spaulding Quartz Diorite. Thin section contains pyroxene, quartz, biotite, plagioclase, and alkali feldspar. Hand sample shows micas, quartz, feldspars, and pyroxene.

Kingdom: Animalia Phylum: Cnidaria Class: Hydrozoa Order: Family: Genus: Species:

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Rock Sample:
The sample is metamorphic. It is green to light-green in color. There are very course grained tabular zones of metamorphism (12x4cm) and light to dark layering with non-uniform shapes and patterns. The grains are aphanitic. The…

Rock Sample:
The sample is fine-grained, and the majority of the rock is dark grey in color. There is a 2.5x4cm white crystal formation on the upper edge of the sample. There are fractures running through the sample. There is some chemical…

From within visible biotite zone

This hornfels was collected from a section of contact metamorphism immediately above the dolerite of the formation from the farm Murrelfontein. It has "spots" of quartz, most likely inverted from tridymite spherulites, in a matrix of devitrified…

Coarse-grained hornblendite (some specimens have a few garnets)

Coarse-grained

pillow lava metamorphosed to zone 2

Contains sutured grain boundaries, conversion of hornblende to magnetite, and some fine-grained alteration products

Rock Sample:
The sample is pinkish gray with brown to green phenocrysts. There are fine-grained to medium-grained phenocrysts (0.5~5mm in length). There is a dark-brown to orange coating, which is evidence of chemical weathering due to oxidation. …

Hornblende Gabbro-Diorite from the Spaulding quartz diorite. Thin section contains hornblende, plagioclase, and quartz. Hand sample contains hornblende, plagioclase, and quartz.

Some alteration has produced epidote, most of the hornblende is prismatic and occurs in two colors

Ichnogenus:

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