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Huckleberry Hill, Avon, Hartford Co., Connecticut, USA

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Latitude & Longitude (WGS84): 41° 48' 39'' North , 72° 54' 12'' West
Latitude & Longitude (decimal): 41.81111,-72.90361
GeoHash:G#: drkjv53pq
Locality type:Hill
Köppen climate type:Dfa : Hot-summer humid continental climate

Residential housing development from about 2000 to 2016 on this hill exposed quartz-mineralized brittle faults, probably related to the Hartford Basin just to the east, cross-cutting the Ordovician hornblende gneiss/amphibolite member of the Collinsville Formation and the Ordovician Bristol Gneiss. Finds were at least along Windsor Court, Tyler Court and Kingswood Road. Some metamorphic mineral crystals were also found in those host rocks. Coordinates are for the summit of the hill.

Turns out Shepard (1837) described loose surface boulders of quartz here (the hill is bisected by the Canton-Avon town line and quartz is likely found on both sides):
A cellular drusy quartz found on Whortleberry-hill [aka Huckleberry Hill] in the south part, of Canton, was used during the last war for millstones. Several acres near the top of this hill are strewed over with large masses of this rock.

Mineral List

11 valid minerals.

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

201.3 - 252.17 Ma

ID: 3188891
Mesozoic volcanic and intrusive rocks

Age: Triassic (201.3 - 252.17 Ma)

Comments: Connecticut Valley Basin

Lithology: Mafic volcanic rocks; conglomerate,arkose,shale,arenite

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Middle Ordovician
458.4 - 470 Ma

ID: 2832746
Bristol Gneiss

Age: Middle Ordovician (458.4 - 470 Ma)

Stratigraphic Name: Bristol Gneiss

Description: Light, medium-grained, massive to well-layered gneiss, composed of plagioclase, quartz, and biotite, also muscovite and garnet in many layers, interlayered in places with dark amphibolite. Bristol Member of Collinsville Formation (Stanley, 1964) is here raised in rank and revised as Bristol Gneiss in the report area. Garnet- and epidote-bearing amphibolite and hornblende gneiss assigned by Stanley to the upper part of his Bristol Member is here assigned to base of the overlying Collinsville Formation and composes the unnamed hornblende gneiss member. As defined here, the Bristol Gneiss consists of plagioclase-quartz gneiss characterized by foliae of muscovite or biotite, or locally chlorite, which in places give the unit a striking pinstriping; contains scattered small garnets and large pods of amphibolite. Average thickness may be about 2,000 ft; thickness varies due to local intense folding. Probably correlates with the Moretown Formation of central MA, in which case it would constitute a fourth member of Stanley's Taine Mountain Formation. Formational status assigned in this report based on its unique textural and lithological character. Inferred age is Middle Ordovician (Simpson, 1990).

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

Lithology: Major:{gneiss}, Minor:{amphibolite}

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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Shepard, Charles U. (1837), A Report on the Geological Survey of Connecticut. Hamlen, New Haven.

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