The flow of time in the Connecticut valley : $b geological imprintsBain, George W. (George William)
Science
The flow of time in the Connecticut valley : $b geological imprints
Bain, George W. (George William)
Geology -- Connecticut River Valley
Route 2 also leads eastward from Greenfield to the French King Bridge
and Millers Falls. The highway out from Greenfield turns north (0.3)
along the west front of the trap ridge, near the summit of which several
individual lava flows are represented by separate sets of columns
superimposed one upon the other (see p. 26). The underlying bedded
sandstones outcrop in the lower wooded slopes. A road branches right
(1.7) to Turners Falls and crosses the lava ridge, but the main highway
continues straight to a sharp curve near Falls River (3.4).
Pillow-shaped masses of lava characterize the bottom of the lava flow
and lie above conglomerate in the bluff to the right. The valley of
Falls River is a fault zone slicing across the lava sheet, which
reappears at the lookout-parking place at Turners Falls (3.5). The
extent to which the waterfall has receded (see pp. 58-59) may be judged
from the length of the gorge.
The route continues left past the bridge entrance (3.6). Ripple-marked
red shales—once Triassic muds in which stray dinosaurs left their
tracks—outcrop by the roadside (4.6 to 5.7), and coarse conglomerate
beds (5.9) overlie the shales and dip steeply towards the river.
Somewhat farther east a broad sand plain (6.0 to 6.8) of glacial outwash
(see p. 59), which ends at the French King gorge, buries the Triassic
bedrock, but once again conglomerate appears and forms the west wall of
the gorge. Pre-Triassic crystalline rocks (6.9) likewise outcrop on the
western cliffs, and form a narrow ridge between the present course of
the river and the pre-glacial channel, which lies below the glacial
delta (7.0 to 7.9) of Millers River.
The road to Northfield turns left (7.9) and another (8.7) leads right to
Millers Falls, but Route 2 continues east, climbing high above the river
(9.9), which flows through a narrow gorge. Gneiss with horizontal
banding outcrops (11.2) in mesa-like hills north of the highway, which
descends to a point (12.5) that was 5.5 feet under water during the 1936
flood. The road continues near the water’s edge for almost half a mile,
and the narrow gorge through gneiss ends at Erving (13.8). Here the
valley widens out into a hilly lowland which has been developed on
schist with occasional bands of gneiss. The road follows the north bank
of the river across this lowland to Orange (17.9). Route 2 continues to
Athol where the Daniel Shays highway enters from the south, but an
alternate route, which turns right in the center of Orange and crosses
Millers River (18.0), provides a preferable short-cut to the Daniel
Shays Highway (21.8). This section of road is lined with stone fences
which memorialize the combined labors of the great Ice Sheet and the
early settlers.
Public-domain text, read in full here on John Shaqi.
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