Browse Items (25 total)

Fresh water marl with plant remains. Specimens selected to include leaf and or stem remains. Hand sample specimen is small and crumbly. Fossil bearing biofloatstone composed of soft silt, mud and limestone matrix, with carbon imprint and original…

Conglomerate, dominated by carbonate pebbles). Only a medium grained (1-10cm) facies collection of out of what was perhaps a 50ft exposure of coarse conglomerates. Light pink quartzite pebbles are interpreted to have been deposited during the…

Fine grained relatively soft calcareous sandstone. Thin Section Fine angular grains with fairly close packing characterize this thin section, with unusually sharp angles. Sample is still clay dominated.

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 (

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.

Coarse grained mainly quartz sandstone with minor lithic and mud incorporated. Cross bedding present. Note the larger grain size of the sample, as well as the grains composed of conglomerate material indicating reworking of older sediments. Present…

Poorly sorted, coarse grained conglomerate; bearing chert, quartzite and granitoid fragments in calcite cement, with an odd mica flake indicating very short transport. The facies that this rock is representative of is uncommon. Conglomerate beds at…

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.

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…

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…

Collected from blocks moved during road construction. Have been moved perhaps 200 yards. More quartzite and igneous and crystaline metamorphic rocks than at Sternenberg sampling site. Thin Section Coarse to fine (7-.1 mm) poorly sorted grains of…

Grain sizes sand to silty sand, rounded and angular with very minor examples of weathering and thin quartz vein present. Collected from the same quarry as FR-2. (FOV: 1.28mm)

Grain size is fine sand to silty sand, mostly angular with some rounded crystals. Various shades of surficial weathering with distinct pockets of orange-brown oxydation. Fresh surfaces brown-green in color. Collected from same quarry as sample FR-1.…

Fresh surfaces are dark blue in color, while weathered surfaces range in shades of green. Asbestos veins intersect throughout the rock, making up ~5% of the crystal mass. (FOV: 1.28)

Angular, silty size gains, composed of equal parts quatz, feldspars and rock fragments. Prominent orange and brown surface oxydation on all samples. Some samples contain evidence of bedding planes. Calicte is found along bedding planes, as well as…

Holocrystalline, medium grained, anhedral, ophitic, dibastic crystals. Low silica percentage (46.3%) for a Diabase, bordering on ultramafic compostion. Calcite is present on weathered surfaces, but not on fresh surfaces. (FOV: 3.2mm)

Angular sand size grains, dominated by quartz, have a brown color with a greenish tint. Calcite found on weathered bedding planes after lithification. Slight folding of the bedding planes in one direction. (FOV: 1.28)

Groundmass dominated by grey calcite and dolomite. Calcite and dolomite crystals are subhedral in thin section and hand sample.. (FOV: 1.28)

Fresh surfaces contain grey-white, anhedral calcite and dolomite crystals. Weathered surfaces are dark brown, with a fine powder observable after handling in hand sample. Bubbles from acid reaction turn dark brown on weathered surfaces. These…

Coarse sand grains made of quartz, surrounded by smaller feldspar grains. Greenish blue surface color, minimal surface weathering.

(Thin section FOV: 1.28)