red chert or jasper, white flecks do not appear to be dolomite or calcite rhombs, flake exhibited slaty fracture
100X ppol
siliceous siltstone or chert with clastic rounded quartz grains, and possible angular feldspar (Paleoindian context)
100x ppol
200x ppol
200x xpol
"Jasper" with relict quartzite granular texture, grains ringed by hematite
possible source: similar to Hardyston Formation Jasper, eastern PA
50x ppol
100x ppol
100x xpol
Chert with iron oxide replacement of carbonates
50X ppol
50X xpol
200X ppol
200X xpol
Flow-banded rhyolite with feldspar and plagioclase altered to kaolin, has Carlsbad twinning
possible source: similar to Blue Hills rhyolite, Boston Basin
50x ppol
50x xpol
50x xpol
Hornfels (siltstone) with flow structure, note angular quartz and deformed mica (magnetite) clumps and rods.
possible source: CT Valley or Narragansett Basin
50X ppol
50X xpol
200X xpol
Hornfels (siltstone) with flow structure, note angular quartz and deformed mica (magnetite) clups and rods.
possible source: CT Valley or Narragansett Basin
200x ppol
200x xpol
Chert with chalcedony inflow, dolomite and probable sponge spicules evident
possible source: Onondaga Formation, Hudson/Mohawk Valleys, NY
50X xpol
100X xpol
200X ppol
200X xpol
Hornfels with flow structure
50X xpol
100X ppol
100X xpol
Brecciated chert, crystallized, with quartz grains forming, possibly at a contact margin
possible source: Lantern Hill, Ledyard, CT
50x ppol
50x xpol
Chert with heavy weathering rind
50x ppol
50x xpol
100x ppol
100x xpol
Rhyolite with plagioclase feldspar
possible source: similar to Lynn rhyolite, Boston Basin
50X xpol
100X xpol
200X xpol
Rhyolite, highly porpheritic with alkali feldspar and blotchy perthite patches, has Carlsbad twinning
possible source: similar to Lynn Rhyolite, Boston Basin
50x ppol
50x xpol
100x xpol
200x xpol
Hornfels (siltstone) with angular quartz, mica to magnetite metamorphism
50X xpol
200X xpol
Chert with dolomite rhombs ringed with iron oxide (carbonate replacement)
possible source: Onondaga Formation, Hudson/Mohawk Valleys, NY
50X ppol
100X xpol
Slate, compression-formed quartz veins show two orientations and events, note high mica content
possible source: eastern MA, VT or ME
50X ppol
50x xpol
100X ppol
200X xpol
Chert with heavy weathering rind, sample was patinated to buff
50x ppol
50x xpol
100x xpol
Rhyolite, plagioclase feldspar indicated by twinning
50x ppol
50x xpol
100x ppol
100x xpol
Fine-grained Hornfels with flow structure and angular quartz grains
50X ppol
50X xpol
100X ppol