| Rock
Source or Site
|
Rock
type
|
Sample
Source
|
magnif.
|
specimen
|
Description
|
|
|
| Blue
Hills, Milton, MA
|
rhyolitic
ash flow
|
J.Cross
|
10x
|
geol.spec.
|
(pending)
|
| Mt.
Kineo,Moosehead Lake, ME
|
rhyolite
flow
|
J.
Cross
|
10x
|
geol.spec.
|
(pending)
|
| Mt.
Jasper, Berlin, NH
|
rhyolite
|
J.Cross
|
10x
|
geol.spec.
|
Mt.
Jasper rhyolite characteristically has no identifiable phenocrysts.
|
| Talcott
Mountain,Fmgtn, CT
|
Talcott
basalt&chert
|
B.Calogero
|
10x
|
geol.
spec.
|
The
section is a contact of basalt from the Talcott flow and the chert deposited
by ground water in the gas cavities of the pillow basalt.
|
| Millbury
site, MA
|
rhyolitic
welded ash flow tuff
|
A.Leveillee,PAL
|
|
local
|
This
welded ash flow tuff has flow lines that are largely glass in a very fine
groundmass.
|
| Lewis-Walpole
site, Fmgtn, CT
|
felsic
rhyolite
|
D.Starbuck
|
10x
|
non-local
|
The
rhyolitic ash flow has a mass of glass shards and plagioclase phenocrysts
but no quartz.
|
| Lewis-Walpole
site, Fmgtn, CT
|
rhyolic
welded ash flow tuff
|
D.Starbuck
|
10x
|
non-local
|
The
welded ash flow tuff contains plagioclase phenocrysts.
|
| Fisher's
Meadow site,Avon,CT
|
chalcedony
|
K.Feder
|
10x
|
local
|
Hematite
diffused into the chaldedony after the layers of silica were deposited
in the gas cavities of pillow basalt.
|
| Lewis-Walpole
site, Fmgtn, CT
|
fossiliferous
sandstone
|
D.Starbuck
|
10x
|
non-local
|
The
sandstone is composed of fine-grained mud with worm burrows filled in with
rounded quartz grains and calcite.
|
| Lewis-Walpole
site, Fmgtn, CT
|
same
as above, higher magnification
|
|
40x
|
|
The
quartz sandstone includes a fossilized shell.
|
| Bugbee-Hathwy
site, W.Htfd,CT
|
hornfels
|
B.Calogero
|
10x
|
local
|
Hornfels
siltstone and fine-grained ilmenite crystals
|
