Browse Items (1651 total)

1:250000

1:62500

1:62500

1:62500

1:62500

Contains inclusions of relict gabbro

1:24000

1:24000

Kingdom: Animalia Phylum: Arthropoda Class: Ostracoda Order: Palaeocopida Family: Zygobolbidae Genus: Species:

This sample is coarse grained and contains fayalite, ferrohedenbergite, and ferrohastingsite.

This granite post-dates deformation and metamorphism. Silver got a U/Pb zircon age of 1125 Ma. This is a most unusual rock type. This rock has small quantities of fayalitic olivine and ferrohedenbergite that occur with mesoperthite and quartz. It…

1:62500

1:62500

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…

Rough, gray

1:62500

1:62500

Kingdom:Plantae Phylum: Tracheophyta Class: Polypodiopsida Order: Family: Genus: Species:

Ferrohypersthene Garnet Biotite Tonalite from the Spaulding Quartz Diorite. Some samples are fairly weathered. Thin section contains garnet, biotite, quartz, and plagioclase. Hand sample shows garnet, biotite, quartz, feldspars, and evidence of…

Very fine grained sandstone and silty shale noted between shale and dark, fine grained sandstone (sample 4 &5).

Thin Section:
Very fine sized sub rounded grains of pyroxene, quartz, and feldspar in a calcic matrix.