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Dayville, Killingly, Windham Co., Connecticut, USAi
Regional Level Types
Dayville- not defined -
KillinglyMunicipality
Windham Co.County
ConnecticutState
USACountry

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Latitude & Longitude (WGS84): 41° 50' 46'' North , 71° 53' 17'' West
Latitude & Longitude (decimal): 41.84619,-71.88823
GeoHash:G#: drkyh1ued
Köppen climate type:Cfb : Temperate oceanic climate
Nearest Settlements:
PlacePopulationDistance
Killingly Center17,282 (2017)1.8km
Danielson3,987 (2017)4.8km
East Brooklyn1,638 (2017)5.5km
Putnam7,214 (2017)7.8km
Brooklyn981 (2017)8.2km


Dayville is a village (coordinates for its center) in the town of Killingly. The amethyst locality's position is uncertain. The crystals are the typical sceptered overgrowths on quartz found in other brittle-faulted areas of the Avalonian terrane, such as at Route 11 in Salem, the abandoned railroad cut in Moosup and at Hopkinton, RI.

Regions containing this locality

North America PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


1 valid mineral.

Detailed Mineral List:

Quartz
Formula: SiO2
Reference: Mineralogical Record (1990) 21:203-213
Quartz var: Amethyst
Formula: SiO2
Reference: Mineralogical Record (1990) 21:203-213

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2
var: Amethyst4.DA.05SiO2

List of minerals arranged by Dana 8th Edition classification

Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
var: Amethyst-SiO2

List of minerals for each chemical element

OOxygen
O Quartz (var: Amethyst)SiO2
O QuartzSiO2
SiSilicon
Si Quartz (var: Amethyst)SiO2
Si QuartzSiO2

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 Macrostrat.org

Middle Ordovician - Ordovician
458.4 - 485.4 Ma



ID: 2812638
Quinebaug Formation

Age: Ordovician (458.4 - 485.4 Ma)

Stratigraphic Name: Quinebaug Formation

Description: Medium- to dark-gray, commonly greenish, medium-grained, well-layered gneiss, composed of hornblende, andesine, biotite, and epidote, commonly with quartz or garnet, interlayered with amphibolite.

Comments: Part of Eastern Uplands; Iapetus (Oceanic) Terrane - Merrimack Synclinorium Original map source: Connecticut Geological and Natural History Survey, DEP, in cooperation with the U.S. Geological Survey, 2000, Bedrock Geology of Connecticut, shapefile, scale 1:50,000

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]

Neoproterozoic
541 - 1000 Ma



ID: 3186948
Neoproterozoic crystalline metamorphic rocks

Age: Neoproterozoic (541 - 1000 Ma)

Lithology: Orthogneiss/paragneiss/metavolcanic gneiss

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]

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

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
White, John and Cook, Robert. (1990), Amethyst Occurrences of the Eastern United States. Mineralogical Record: 21(3): 203-213.


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