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About the Pequonnock River Valley

These maps and the information below were compiled from a 1988 study by the King's Mark Environmental Team1.

Forest Cover in the Valley

Mixed Hardwood
The predominant species in the mixed hardwood areas are oaks, hickories, maples and birches. Some species such as tulip or beech may occur singly or in small groups.


Eastern Hemlock
Eastern Hemlock is a coniferous species.

Further Details



Surface Geology of the Valley

Surface Geology

The majority of the Valley's Parkland is covered by a relatively thin blanket (i.e., less than 10 feet) of unconsolidated material known as till. Till is a glacial sediment composed of rock particles ranging in size from small clay particles to large boulders deposited directly by glacial ice. It's a mish mash of fine grained particles unevenly intermixed with coarse particles of all sizes. The texture of till 's surface is mostly sandy, stony and loose.

Stratified Drift
Stratified drift is a sandy and gravely sediment laid down by glacial meltwater during the retreat. Interestingly the sand and gravel deposits in the northeast corner flaking the east side of the river were probably runoff from places mined along the river during earlier times. In some spots it may be up to 90 feet thick.

Formed post-glacially, alluvium deposits consist primarily of sand silt and fine gravel. These were deposited along recent stream channels or on floodplains. Layers of clay may also be present. Alluvium deposits are generally less than 10 feet thick.

Swamp Land
Swamp sediments consists of sand. slit, clay and decayed organic material covering relatively low-lying areas. The swamp occupying the valley developed after the last period of glaciation in the state: about 10,000 to 12,000 years ago.

1 - King's Mark Environmental Review Report For Pequonock River Valley - 1988 link>