The Barre daily times. (Barre, Vt.) 1897-1959, 1910-01-17

AtNHhAttiH anu AAM'h ANNAt AMN N1AtA
range Ia thickness 81 sheets Is from
2 10 5 or % feet; Che extremes are !
to 40 feet
Fletcher Quarry.
The Fletcher quarry is On Robeson
Mountains near its west southwest end
jand on its southeast side. in Woodbury..
Operator, r. T. Fletcher, Hardwick, Vt.
The granite, Woodbury. gray is a
biotite granite Of light gray shade lbe-
tween light Barre" and the granite Of
IIallowcll Mel and Of medium texture
with ieldspafs up TO 0.3 inch and mica
TO Oh inch. This Is q brilliant granite
with marked mineral contrasts. The
quartz and feldspar areas are rather
large and well defined The polish Is
poor owing to the large Size Of the mi.
cas- The quarry, opened about lSS7,
is estimated as measuring 300 feet III
a northwest direction or across the ridge
by 200 along it and from 20 Of 40 in
depth. Il is practically the beginning Of
a cross section Of the ridge and dome.
Near It's west southwest end the Fleteh-
Ter quarry cuts the ridge OF Robson
Mountain from southeast to northwest
The sheets exposed here are from ] to 5
feet thick, horizontal at the top of the
ridge, but eurving over on the southeast
with a dip II rs degrees to 30 degrees,
and determining the slope Of the ridge
on that side These sheets are, however,
intersected by another set from 70 9
feet thick. dipping degrees to 10 de.
greas s 10 degrees M. in the direction Of
/ the axis Of the ridge tn the Woodbury.
Granite company's quarries, roughly
about $50 feet N 80 degrees f. Of the
Fletcher quarry, the sheets al the top
Of the ridge Turn dipping to the north
ern horizon, Lower down On the south
east side Of the ridge they are from
2 to rs feet thick and dip 20 degrees
sSE.. with an intersecting set Of the
Fletcher quarry.
Tho Only explanation offered for this
double sheet structure Is the existence
at some time 81 a secondary compress
sive strain operating differently from
that which produced the primary sheet
structure To which The ridge owes It's
form. and giving hise to a nearly hor-
izontal set If joints A. sheet paintings
There Is now marked eompressive
strain 10 the Fletcher quarry operating
from northeast 20 southwest parting
the sheets and giving rise even IN the
upper part Of the quarry to horizontal
strain features. its existence lends sup
port "a such an expansion In 300 gran.
tie Qparrics visited thus far by the writ /
structure o. horizontal jointing OBJ
served
The plant comprises. At the quarry
two derriehs and a large rock drill st
the cutting shed 40 Hardwick a lotion (
and a ldton derrick, = hosting engine. /
Teton locomotive crane, 40.horss
power engine, and three polishers Trans
portation Is effected by siding from the
Hardwick and Woodbury. railroad, which I
brings the stone eight miles 70 tie cut
ting shed and to the ST. Johnshury and /
Lake Champlain railroad
woodbury. Granite company's Quarnes.
The Woodbury. Granite company +
qusries are on Robson Mountain. rough
81 from 400 to 2,l00 feet from the
Fletcher quarry 10 woodbury. Operator
Woodbury. Granite company, Hardwiek
" Il
THE granite Is 81 two sorts Wood
bury gray i biotite granite Of med
ium gray shade and medium texture
with ieldspsr up to 0.3 inch and mice
e Oh inch.
This stone % the csc 4 like that If
the fleraher quarry except shat It's
quartz PARTICLES are a iittle Auer less
numerous snd less smoky ITS mineral
contrasts are. therefore weaker The
polish i poor owing 70 abundant and
Mthef large mica scales hat the cons
tfasts On the polished face are strong
The other sort Woodbury. Bashaw,
IS q biotts granite of medium gray
shade labout like that Of Concord gram
tie. but p3ofe hlnlsh ard with more
contrasts, and 81 Enc incliuine % med
INN texture with feldspars mp to on neh
and miea "a Oh. This i monumental
granite rs mineral contrasts are not
as marked either in The rough or the
polish as il the Woodbury. gray This
II dne to the feldspars being less saolin
ICED and thus less white. Its texture
is finer and It polishes better Three
compression tests Of the Woodbury.
gray INSIDE fof tire firm at the United
States Arsenal at WATERFOWL, Mass,
Welded an average of 20,so5 pounds per
square inch.
The quarries consist Of four openings
The main and western one. made in 1880
beginning &c the south foot Of Che ridge
extends about 500 feet along L and 400
ffat nortiward mp its side with ala Az
eraae depth nf Ed feet The upper
above the north 81 the main
one, IS about 200 feet square. and is
north side Is at the top OF the hill
nearly 500 feet higher than the lower