Browse Items (1651 total)

1:62500

1:62500
Surveyed 1915-1916

1:62500
Surveyed 1915-1916

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…

1:625000
includes Genesee river valley and early SUNY Geneseo campus

1:625000
includes Genesee river valley and early SUNY Geneseo campus

Includes sillimanite and K-spar

Minerals found in the calcsilicate facies contain quartz, diopside, enstatitic pyroxene, tremolite, calcite, and phlogopite. However, only a few thin sections have been found to contain all phases. In some specimens, the pyroxene is close to 100%…

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.

Hand Sample: Porphyritic orange-pink rhyolite. Dominantly potassium feldspar with some black crystals. Weathers to brown-black and yellow-brown.

Contains large augite crystals

1:62500

1:62500

1:62500
all are in very bad condition

1:48000
entrenched meander

1:62500
all are in very bad condition

1:48000
entrenched meander