SIDE TRIPS OF GEOLOGICAL INTEREST

_Gold Panning_

There are several locations immediately adjacent to the Calvin Coolidge

State Forest Park where some gold can still be obtained from stream

sands and gravels. The abandoned town of Five Corners offers the park

visitor ample chance to “try his luck.” In fact, several local people

still obtain small gold nuggets and a good deal of gold dust from the

streams in the vicinity of Five Corners (See geologic map for geographic

location). Other possible “panning” locations would include Reading Pond

Brook, Buffalo Brook and Kingdom Brook. The gold which is found is

probably derived from nearby gold-bearing quartz veins.

The equipment needed for an afternoon of panning is relatively simple to

obtain. A wide, rather shallow pan with gently sloping sides is really

all that is needed. Gravel and sand, which you find concentrated on the

upstream side of natural rock riffles in the stream bed should be placed

together with water in your pan. Then the pan should be rotated and the

lighter rock materials decanted. The heavy gold will be concentrated in

the bottom of the pan.

_Asbestos and Talc_

For you who might be interested in mineral collecting it is suggested

that a trip to an old pit near Five Corners might prove rewarding. Walk

down Broad Brook from the bridge at Five Corners until you locate the

first small tributary entering on your left. Turn left up this tributary

and continue to walk for approximately one hundred yards. On your left

you will see the remains of a pit dug into the side of the stream bank

which, at this location, is lined with rocks of the Ottauquechee

formation. You will quickly note the fibrous asbestos in the walls of

this pit; however, if you wish to collect specimens of this mineral be

extremely careful and avoid standing beneath any overhanging rock

material. Talc, which feels “soapy” to the touch, is also abundant in

this immediate area. This asbestos and talc occur in a lenticular-shaped

body which is perhaps eight hundred feet wide and of an undetermined

length. It is not certain when these minerals formed; however, it was

probably in the early history of the region.

_Garnet_

Good specimens of garnet can be found in the rocks of the Bethel

formation. These garnets are not of gem quality but still offer good

collecting for the amateur mineralogist. Good collecting localities

exist along State Highway 100A and at several different spots within the

Park itself. A hike along the northern boundary of the Park would

intersect several excellent collecting spots.

_Vermont Marble Company Exhibit, Proctor, Vermont_

If time permits, or a rainy day arrives, a visit to the Vermont Marble

Company Exhibit in Proctor, Vermont, is highly recommended. Marble is a

metamorphic rock which was originally sedimentary in nature. Lime muds

hardened into limestones and then, converted by metamorphism, became

marble. The marble exhibit at Proctor, termed “The largest Marble

Exhibit in the World,” displays over 100 varieties of marble and igneous

rock, granite. Fossils can be seen in some of the varieties of marble,

which demonstrates that under certain conditions recognizable fossils do

occur in metamorphic rocks. Most of the marble seen in this exhibit is

quarried nearby; however, for safety reasons visitors are not allowed to

enter the quarries. It is interesting to note that these marbles are

about the same age as the rocks seen in Coolidge State Forest Park.

The Geology of Calvin Coolidge State Forest · 第 8 / 10 题