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The predominant lithology of the Peck Lake Formation is a sillimanite-garnet-biotite-quartz-oligoclase gneiss with pods and lenses consisting of two feldspars and quartz (anatectic?). The lithology is widespread throughout the Adirondacks and may…

Muscovite-sillimanite schist where much of the sillimanite has been somewhat altered to muscovite. This sample may also contain muscovite pseudomorphs after staurolite.

higher metamorphic grade than specimen one, lower than speciment 3

Coarse

Muscovite-biotite schist containing large sillimanite crystals-mostly retrograded to muscovite

Granite from the Spaulding Quartz Diorite. Thin section contains plagioclase, biotite, quartz, alkali feldspar, some garnet, and sillimanite. Hand sample shows quartz, feldspars, sillimanite, and mica.

with sillimanite retrograde, bedding has been destroyed and turned into "soup"

Kingdom: Animalia Phylum: Cnidaria Class: Anthozoa Subclass: Order: Family: Genus: Species:

Kingdom: Animalia Phylum: Cnidaria Class: Anthozoa Subclass: Order: Family: Genus: Species:

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

1:24000

1:24000

Kingdom: Animalia Phylum: Chordata Class: Chondrichthyes Order: Family: Genus: Species:

Shale, foliated, and bearing organic matter, from the interbeds between sandstone layers. Fine grained laminated sands between shales were uncollectible, but present. Friable and fragile.

Thin Section:
Very fine to fine grain, poorly sorted…

Organic rich to moderate black to light grey shale. Some parts of FM-4 are silty shale. Minor rust stains are present on lighter samples. Representative of upper portion of a turbidite sequence.

Thin Section
Very fine (