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Poquonock River outcrops, Long Hill, Trumbull, Fairfield Co., Connecticut, USA

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Latitude & Longitude (WGS84): 41° 16' North , 73° 13' West
Latitude & Longitude (decimal): 41.26667,-73.21667
Köppen climate type:Cfa : Humid subtropical climate

Outcrops of the Straits Schist which occur as ledges on the northwest bank of the Poquonock River in the Long Hill area of Trumbull, Connecticut contain sub-parallel, nearly vertical quartz veins. Topaz crystals, some of which are gemmy and of golden color, are present in the quartz veins. Crystals up to 15 x 8 mm have been collected.

Collecting commenced in 1979 during the time that Connecticut route 25 and Connecticut route 111 were under construction. Status of collecting at present is unknown.

Mineral List

2 valid minerals.

Rock Types Recorded

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Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on

Devonian - Silurian
358.9 - 443.8 Ma

ID: 2761623
The Straits Schist (Goshen Formation of Massachusetts)

Age: Paleozoic (358.9 - 443.8 Ma)

Stratigraphic Name: Goshen Formation; The Straits Schist

Description: Silvery to gray, non-rusty, coarse- to very coarse grained, generally poorly layered schist, composed of quartz, muscovite, biotite, oligoclase, garnet, and commonly with staurolite and kyanite or sillimanite; graphitic almost throughout. Distinctive sequence of metamorphic strata overlying the Collinsville Formation in the Bristol quad., is here correlated with the Straits Schist of Fritts (1963) in the Southington quad. Consists mainly of rusty-weathering, medium- to coarse-grained, commonly crenulated, garnet-bearing, graphitic, muscovite-rich, plagioclase-quartz schist with graded bedding. Unit is called The Straits Schist following the original usage of Rodgers and others (1959). In the southern part of the Bristol quad., unit includes the Southington Mountain Member (here reduced in rank) in its upper part. Age of The Straits is inferred to be Silurian or Devonian. Unit is tentatively correlated with the Goshen Formation based on lithologic similarities and a possible unconformity at the base (Simpson, 1990).

Comments: Part of Central Lowlands; Iapetus (Oceanic) Terrane - Connecticut Valley Synclinorium; Hartland Belt Secondary unit description per CT008.

Lithology: Major:{schist}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License

This page contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


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"Bedrock Geology of the Long Hill Quadrangle 1963-1965" by William Patrick Crowley, Quadrangle Report of the State Geological and Natural History Survey of Connecticut.

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