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Reed's Gap Quarry (New Haven Trap Rock quarry; Tilcon Durham quarry), Durham, Middlesex Co., Connecticut, USAi
Regional Level Types
Reed's Gap Quarry (New Haven Trap Rock quarry; Tilcon Durham quarry)Quarry
Durham- not defined -
Middlesex Co.County
ConnecticutState
USACountry

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Latitude & Longitude (WGS84): 41° 28' 5'' North , 72° 43' 54'' West
Latitude & Longitude (decimal): 41.46818,-72.73191
GeoHash:G#: drk7bvn1x
Locality type:Quarry
Köppen climate type:Cfa : Humid subtropical climate
Nearest Settlements:
PlacePopulationDistance
Durham2,933 (2017)4.5km
Wallingford Center18,209 (2017)7.5km
Wallingford17,712 (2017)7.7km
Meriden59,988 (2017)10.0km
Middletown46,756 (2017)12.5km


This basalt (trap rock) quarry is located 7.1 km (4.4 miles) ENE of Wallingford center, New Haven County, and some references such as Ryerson (1972) place it in this town. Although it is on Wallingford's eastern border, it is however, mostly in Durham, Middlesex County and it was referred to by Tilcon as their Durham quarry in Brunet (1980), but has a Wallingford address on Tilcon's web site. Newton (2004) indicates it has operated at least since 1939 and perhaps even 10 years earlier as Tidewater Trap Rock Company.

It is best known for its fluorite crystals, a rarity in trap rock from Connecticut. Most good minerals occur in open cracks and brecciated fault zones rather than in gas vesicles.

Regions containing this locality

North America PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


15 valid minerals.

Detailed Mineral List:

Albite ?
Formula: Na(AlSi3O8)
Analcime
Formula: Na(AlSi2O6) · H2O
'Apophyllite'
Aragonite
Formula: CaCO3
Babingtonite
Formula: Ca2(Fe,Mn)FeSi5O14(OH)
Calcite
Formula: CaCO3
'Chabazite'
'Chabazite var: Phacolite'
Chalcopyrite
Formula: CuFeS2
Datolite
Formula: CaB(SiO4)(OH)
Epidote
Formula: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Fluorite
Formula: CaF2
'Gmelinite'
Gypsum
Formula: CaSO4 · 2H2O
Gypsum var: Selenite
Formula: CaSO4 · 2H2O
Hematite
Formula: Fe2O3
Laumontite
Formula: CaAl2Si4O12 · 4H2O
'Limonite'
Formula: (Fe,O,OH,H2O)
Prehnite
Formula: Ca2Al2Si3O10(OH)2
'Pumpellyite' ?
Pyrite
Formula: FeS2
Quartz
Formula: SiO2
Quartz var: Amethyst
Formula: SiO2
Quartz var: Blue Quartz
Formula: SiO2
'Stilbite subgroup'

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Chalcopyrite2.CB.10aCuFeS2
Pyrite2.EB.05aFeS2
Group 3 - Halides
Fluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
Hematite4.CB.05Fe2O3
Quartz4.DA.05SiO2
var: Amethyst4.DA.05SiO2
var: Blue Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Aragonite5.AB.15CaCO3
Calcite5.AB.05CaCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Gypsum7.CD.40CaSO4 · 2H2O
var: Selenite7.CD.40CaSO4 · 2H2O
Group 9 - Silicates
Albite ?9.FA.35Na(AlSi3O8)
Analcime9.GB.05Na(AlSi2O6) · H2O
Babingtonite9.DK.05Ca2(Fe,Mn)FeSi5O14(OH)
Datolite9.AJ.20CaB(SiO4)(OH)
Epidote9.BG.05a{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Laumontite9.GB.10CaAl2Si4O12 · 4H2O
Prehnite9.DP.20Ca2Al2Si3O10(OH)2
Unclassified Minerals, Rocks, etc.
'Apophyllite'-
'Chabazite'-
'var: Phacolite'-
'Gmelinite'-
'Limonite'-(Fe,O,OH,H2O)
'Pumpellyite' ?-
'Stilbite subgroup'-

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
Group 9 - NORMAL HALIDES
AX2
Fluorite9.2.1.1CaF2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 29 - HYDRATED ACID AND NORMAL SULFATES
AXO4·xH2O
Gypsum29.6.3.1CaSO4 · 2H2O
Group 54 - NESOSILICATES Borosilicates and Some Beryllosilicates
Borosilicates and Some Beryllosilicates with B in [4] coordination
Datolite54.2.1a.1CaB(SiO4)(OH)
Group 58 - SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)
Epidote58.2.1a.7{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=5
Babingtonite65.4.1.2Ca2(Fe,Mn)FeSi5O14(OH)
Group 72 - PHYLLOSILICATES Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with 4-membered rings
Prehnite72.1.3.1Ca2Al2Si3O10(OH)2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Albite ?76.1.3.1Na(AlSi3O8)
Group 77 - TECTOSILICATES Zeolites
Zeolite group - True zeolites
Analcime77.1.1.1Na(AlSi2O6) · H2O
Laumontite77.1.1.4CaAl2Si4O12 · 4H2O
Unclassified Minerals, Mixtures, etc.
'Apophyllite'-
Aragonite-CaCO3
'Chabazite'-
'var: Phacolite'-
'Gmelinite'-
Gypsum
var: Selenite
-CaSO4 · 2H2O
'Limonite'-(Fe,O,OH,H2O)
'Pumpellyite' ?-
Quartz
var: Amethyst
-SiO2
var: Blue Quartz-SiO2
'Stilbite subgroup'-

List of minerals for each chemical element

HHydrogen
H BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)
H DatoliteCaB(SiO4)(OH)
H PrehniteCa2Al2Si3O10(OH)2
H Limonite(Fe,O,OH,H2O)
H LaumontiteCaAl2Si4O12 · 4H2O
H Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
H Gypsum (var: Selenite)CaSO4 · 2H2O
H AnalcimeNa(AlSi2O6) · H2O
H GypsumCaSO4 · 2H2O
BBoron
B DatoliteCaB(SiO4)(OH)
CCarbon
C CalciteCaCO3
C AragoniteCaCO3
OOxygen
O BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)
O CalciteCaCO3
O QuartzSiO2
O DatoliteCaB(SiO4)(OH)
O PrehniteCa2Al2Si3O10(OH)2
O Quartz (var: Amethyst)SiO2
O AragoniteCaCO3
O Limonite(Fe,O,OH,H2O)
O LaumontiteCaAl2Si4O12 · 4H2O
O Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
O Gypsum (var: Selenite)CaSO4 · 2H2O
O AnalcimeNa(AlSi2O6) · H2O
O GypsumCaSO4 · 2H2O
O Quartz (var: Blue Quartz)SiO2
O HematiteFe2O3
O AlbiteNa(AlSi3O8)
FFluorine
F FluoriteCaF2
NaSodium
Na AnalcimeNa(AlSi2O6) · H2O
Na AlbiteNa(AlSi3O8)
AlAluminium
Al PrehniteCa2Al2Si3O10(OH)2
Al LaumontiteCaAl2Si4O12 · 4H2O
Al Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Al AnalcimeNa(AlSi2O6) · H2O
Al AlbiteNa(AlSi3O8)
SiSilicon
Si BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)
Si QuartzSiO2
Si DatoliteCaB(SiO4)(OH)
Si PrehniteCa2Al2Si3O10(OH)2
Si Quartz (var: Amethyst)SiO2
Si LaumontiteCaAl2Si4O12 · 4H2O
Si Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Si AnalcimeNa(AlSi2O6) · H2O
Si Quartz (var: Blue Quartz)SiO2
Si AlbiteNa(AlSi3O8)
SSulfur
S PyriteFeS2
S ChalcopyriteCuFeS2
S Gypsum (var: Selenite)CaSO4 · 2H2O
S GypsumCaSO4 · 2H2O
CaCalcium
Ca FluoriteCaF2
Ca BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)
Ca CalciteCaCO3
Ca DatoliteCaB(SiO4)(OH)
Ca PrehniteCa2Al2Si3O10(OH)2
Ca AragoniteCaCO3
Ca LaumontiteCaAl2Si4O12 · 4H2O
Ca Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Ca Gypsum (var: Selenite)CaSO4 · 2H2O
Ca GypsumCaSO4 · 2H2O
MnManganese
Mn BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)
FeIron
Fe BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)
Fe PyriteFeS2
Fe Limonite(Fe,O,OH,H2O)
Fe ChalcopyriteCuFeS2
Fe Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Fe HematiteFe2O3
CuCopper
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

Early Jurassic
174.1 - 201.3 Ma



ID: 2779471
Holyoke Basalt

Age: Early Jurassic (174.1 - 201.3 Ma)

Stratigraphic Name: Holyoke Basalt

Description: Greenish-gray to black (weathers bright orange to brown), fine- to coarse-grained, grading from basalt near contacts to gabbro in the interior, composed of pyroxene and plagioclase with accessory opaques and locally olivine or devitrified glass.

Comments: Part of Central Lowlands; Newark Terrane - Hartford and Pomperaug Mesozoic Basins. Part of Newark Supergroup (Upper Triassic and Lower Jurassic). Part of Meriden Formation of Krynine (1950) (Lower Jurassic); CT005. 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:{basalt,gabbro}

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]

Triassic
201.3 - 251.902 Ma



ID: 3188891
Mesozoic volcanic and intrusive rocks

Age: Triassic (201.3 - 251.902 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]

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)
Schairer, J. F. (1931): The Minerals of Connecticut. State Geological and Natural History Survey, Bulletin 51. Hartford, Conn.
Yedlin, Neal. (1962), The Micro-mounter. Rocks and Minerals: 37(5-6): 248.
Ryerson, Kathleen H. (1972): Rock Hounds Guide to Connecticut. Pequot Press.
Brunet, William M. (1980): Minerals of the Trap Rock Ridges of the Connecticut Valley With Emphasis on Reed’s Gap Quarry Near Durham. Rocks and Minerals: 55 (6): 232-5.
Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70 (6): 403.
Henderson, William A. (1995): Microminerals of Connecticut; Rocks & Minerals (Connecticut Issue): 70 (6): 420-425.
Pawloski, John. (2006), Connecticut. in: Fluorite, The Collector's Choice. Lithographie, East Hampton, Connecticut: 64.

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