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Conklin Limestone Company quarry (Falls Village Quarry), Falls Village, Canaan, Litchfield Co., Connecticut, USA

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Latitude & Longitude (WGS84): 41° 59' 20'' North , 73° 21' 16'' West
Latitude & Longitude (decimal): 41.98889,-73.35444
GeoHash:G#: dr7yfgbgj
Locality type:Quarry
Köppen climate type:Dfb : Warm-summer humid continental climate

Marble quarry situated in the Cambrian Stockbridge Marble. Located on Sand Road north of Falls Village in the town of Canaan. It was opened by Charles Conklin in 1938 and is still owned and operated by the third generation, Jesse and George Conklin (in the same family that owns the Conklin Quarry in Rhode Island). Produces aggregate and marble building stone.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

11 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

Formula: CaCO3
Colour: white to pale grey
Fluorescence: lavender
Description: Primary component of the Stockbridge Marble, so mostly as anhedral grains. Rare vein filling by coarse-grained, cleavable masses.
Reference: Harold Moritz collection
Formula: CuFeS2
Habit: anhedral grains
Colour: iridescent
Reference: Harold Moritz collection
'Chlorite Group'
Habit: subhedral grains
Colour: dark green
Reference: Harold Moritz collection
Formula: CaMgSi2O6
Habit: subhedral flattened elongated prisms (pseudomorphed by tremolite)
Colour: yellowish-white
Fluorescence: blue-white
Description: Pseudomorphs of tremolite after diopside can reach 10 cm, usually partly etched out and having a yellowish to chalky appearance with basal parting preserved.
Reference: Harold Moritz collection
Formula: CaMg(CO3)2
Habit: curved rhombohedra
Colour: white to pale gray
Description: A principle component of certain layers in the Stockbridge Marble, so mostly anhedral grains. Rare drusy crystals lining fracures.
Reference: Harold Moritz collection
Formula: α-Fe3+O(OH)
Habit: botryoidal
Colour: dark brown with iridescence
Description: Lining fractures in a loose, rusty, calcareous schist boulder with selenite.
Reference: Harold Moritz collection
Formula: CaSO4 · 2H2O
Habit: flat prisms
Colour: colorless
Description: Micro crystals and coatings filling thin fractures in a loose, rusty, calcareous schist boulder.
Reference: Harold Moritz collection
Gypsum var: Selenite
Formula: CaSO4 · 2H2O
Habit: flat prisms
Colour: colorless
Description: Micro crystals and coatings filling thin fractures in a loose, rusty, calcareous schist boulder.
Reference: Harold Moritz collection
Reference: U.S. Geological Survey, (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Formula: Na4Al3Si9O24Cl
Habit: subhedral elongated prisms, square cross-section
Colour: gray to dark gray
Fluorescence: pale yellow
Description: Crystals to 15m or so, translucent, but look like mechanical pencil lead lying in fine-grained, gray dolomite-phlogopite-tremolite-sulfide rock. Crystals mostly first order prisms with square cross-sections modified by minor second order prisms. Poorly terminated.
Reference: Harold Moritz collection
Formula: KMg3(AlSi3O10)(OH)2
Habit: anhedral grains
Colour: light brown
Fluorescence: yellow
Reference: Harold Moritz collection
Formula: FeS2
Habit: anhedral grains
Colour: brassy
Reference: Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70 (6): 398.
Formula: SiO2
Habit: massive, rare quartzoids to short prismatic
Colour: clear colorless to smoky
Description: Dark smoky massive pods and stringers common, rare drusy crystals lining fractures.
Reference: Harold Moritz collection
Formula: ☐{Ca2}{Mg5}(Si8O22)(OH)2
Habit: euhedral to subhedral blades, brittle fibers
Colour: white, pale gray, pale green
Fluorescence: blue-white
Description: Occurs in many ways - as individual scattered euhedral crystals, as parallel or radiating aggregates, which can grade into fibrous crystals, and as etched pseudomorphs after diopside. Crystals can reach 5 cm and aggregates can be a couple of dm.
Reference: Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70 (6): 397.

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Group 4 - Oxides and Hydroxides
Group 5 - Nitrates and Carbonates
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
'Gypsum'7.CD.40CaSO4 · 2H2O
var: Selenite7.CD.40CaSO4 · 2H2O
Group 9 - Silicates
Unclassified Minerals, Rocks, etc.
'Chlorite Group'-

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 1:1
AmBnXp, with (m+n):p = 1:2
Gypsum29.6.3.1CaSO4 · 2H2O
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Group 66 - INOSILICATES Double-Width,Unbranched Chains,(W=2)
Amphiboles - Mg-Fe-Mn-Li subgroup
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with other Be/Al/Si frameworks
Unclassified Minerals, Rocks, etc.
'Chlorite Group'-
var: Selenite
-CaSO4 · 2H2O

List of minerals for each chemical element

H Goethiteα-Fe3+O(OH)
H GypsumCaSO4 · 2H2O
H PhlogopiteKMg3(AlSi3O10)(OH)2
H Gypsum (var: Selenite)CaSO4 · 2H2O
H Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
C CalciteCaCO3
C DolomiteCaMg(CO3)2
O CalciteCaCO3
O DiopsideCaMgSi2O6
O DolomiteCaMg(CO3)2
O Goethiteα-Fe3+O(OH)
O GypsumCaSO4 · 2H2O
O MarialiteNa4Al3Si9O24Cl
O PhlogopiteKMg3(AlSi3O10)(OH)2
O QuartzSiO2
O Gypsum (var: Selenite)CaSO4 · 2H2O
O Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
Na MarialiteNa4Al3Si9O24Cl
Mg DiopsideCaMgSi2O6
Mg DolomiteCaMg(CO3)2
Mg PhlogopiteKMg3(AlSi3O10)(OH)2
Mg Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
Al MarialiteNa4Al3Si9O24Cl
Al PhlogopiteKMg3(AlSi3O10)(OH)2
Si DiopsideCaMgSi2O6
Si MarialiteNa4Al3Si9O24Cl
Si PhlogopiteKMg3(AlSi3O10)(OH)2
Si QuartzSiO2
Si Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
S ChalcopyriteCuFeS2
S GypsumCaSO4 · 2H2O
S PyriteFeS2
S Gypsum (var: Selenite)CaSO4 · 2H2O
Cl MarialiteNa4Al3Si9O24Cl
K PhlogopiteKMg3(AlSi3O10)(OH)2
Ca CalciteCaCO3
Ca DiopsideCaMgSi2O6
Ca DolomiteCaMg(CO3)2
Ca GypsumCaSO4 · 2H2O
Ca Gypsum (var: Selenite)CaSO4 · 2H2O
Ca Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
Fe ChalcopyriteCuFeS2
Fe Goethiteα-Fe3+O(OH)
Fe PyriteFeS2
Cu ChalcopyriteCuFeS2

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

Ordovician - Neoproterozoic
443.8 - 1000 Ma

ID: 3190671
Precambrian-Phanerozoic sedimentary rocks

Age: Neoproterozoic to Ordovician (443.8 - 1000 Ma)

Lithology: Mudstone-carbonate-sandstone-conglomerate

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]

Early Cambrian
511 - 541 Ma

ID: 2790571
Unit a [of Stockbridge Marble]

Age: Cambrian (511 - 541 Ma)

Stratigraphic Name: Stockbridge Marble

Description: White to pale-gray, massive, smooth-weathering dolomite marble.

Comments: Part of Western Uplands; Proto-North American (Continental) Terrane - Carbonate Shelf Secondary unit description from USGS Geologic Names lexicon (ref. CT017): Revised as Stockbridge Formation, a heterogeneous rock group that may be mapped as seven lithostratigraphic units A through G (ascending). Highest bed as mapped by Dale (1923) is interbedded with overlying schist and is reassigned to Walloomsac Formation. Units A, B, and C are mostly dolostone and include important beds of arkose and phyllite. Units D and F are heterogeneous rocks consisting of silty limestone, dolostone, calcite marble, phyllite, and calcareous sandstone. Sandstone shows cross-stratification that allows determination of the top of bedding. Units E and G are massive, white to gray calcite marble that include interbedded pale, massive, fine-grained dolostone. Because of this heterogeneity, the name is revised to Stockbridge Formation. Excellent exposures may be seen at Vossburg Hill and on hillside south of South Egremont village in Egremont quad, MA and NY. Yields no fossils but overlies Cheshire Quartzite of Early Cambrian age and underlies Middle Ordovician Walloomsac Formation; therefore, the Stockbridge spans the age between Early Cambrian and Early or Middle Ordovician.

Lithology: Major:{marble}

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 Macrostrat.org, used under Creative Commons Attribution 4.0 License


Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70 (6): 398.
Anonymous. (2012): "2012 USGS Aggregates Industry Atlas" in Aggregates Manager: 17(6): 72, 129.

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