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New Britain, Hartford Co., Connecticut, USAi
Regional Level Types
New Britain- not defined -
Hartford Co.County
ConnecticutState
USACountry

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Key
Lock Map
Latitude & Longitude (WGS84):
41° 40' 3'' North , 72° 42' 4'' West
Latitude & Longitude (decimal):
Nearest Settlements:
PlacePopulationDistance
Newington30,562 (2017)3.9km
New Britain72,808 (2017)6.5km
Wethersfield26,668 (2017)6.6km
Kensington8,459 (2017)6.7km
Glastonbury31,876 (2017)9.2km


The bedrock geology of New Britain consists of Triassic-Jurassic Hartford Basin continental sedimentary rocks (arkosic sandstones, mudstones, and lacustrian black shales) interlayered with three basalt flows. The bedrock is heavily faulted, with some exposures showing steeply dipping, N45E trending faults every few meters. Mineralization is hosted primarily by the fault veins (low temperature hydrothermal deposition) and by gas cavities in the basalt.

There are numerous localities where the fault veins were well exposed by road cuts and other construction sites, which all show a similar suite of minerals - primarily dolomite, calcite, Herkimer-type quartz, barite, bitumen (mobilized from the lacustrian black shales), and sulfides.

Numerous small traprock quarries and construction site exposed the lava flows. Besides the vein mineralization, gas cavities in the basalt host the typical suite of datolite, prehnite, quartz, calcite, zeolites, apophyllite, etc.

Coordinates are for the City Hall.

Regions containing this locality

North America PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

Mineral list contains entries from the region specified including sub-localities

31 valid minerals.

Detailed Mineral List:

'Amphibole Supergroup'
Formula: AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Reference: Miller, F. W. (circa 1986), Hydrothermal Quartz and Barite Veins in the Basalt of New Britain, Connecticut. Harvard University Mineralogical Musum Association.
'Amphibole Supergroup var: Byssolite'
Formula: AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Reference: Miller, F. W. (circa 1986), Hydrothermal Quartz and Barite Veins in the Basalt of New Britain, Connecticut. Harvard University Mineralogical Musum Association.
Analcime
Formula: Na(AlSi2O6) · H2O
Reference: Jeremy Zolan, Mike Polletta, and Paul Stroh collections
Anglesite ?
Formula: PbSO4
Description: unconfirmed, no details given by reference, not seen on many examined specimens
Reference: Januzzi, Ronald E. (1976), Mineral Localities of Connecticut and Southeastern New York State. The Mineralogical Press, Danbury, Connecticut.
Anhydrite
Formula: CaSO4
Aragonite
Formula: CaCO3
Aurichalcite
Formula: (Zn,Cu)5(CO3)2(OH)6
Habit: crusts to extremely tiny crystal sprays
Colour: blue-green
Description: secondary crusts associated with metal sulfides in fault veins
Reference: Miller, F. W. (circa 1986), Hydrothermal Quartz and Barite Veins in the Basalt of New Britain, Connecticut. Harvard University Mineralogical Museum Association.
Azurite
Formula: Cu3(CO3)2(OH)2
Baryte
Formula: BaSO4
'Bitumen'
Bornite
Formula: Cu5FeS4
Habit: massive
Colour: black with minor iridescence
Description: As isolated masses or associated with other sulfides such as galena, sphalerite and chalcopyrite and secondary malachite.
Reference: Weber, Marcelle H. and Earle C. Sullivan. (1995), Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70(6): 398.
Calcite
Formula: CaCO3
Cerussite
Formula: PbCO3
Habit: encrustations
Colour: pale gray to yellow gray
Description: earthy to crusty alteration of galena in fault veins
Reference: Januzzi, Ronald E. (1976), Mineral Localities of Connecticut and Southeastern New York State. The Mineralogical Press, Danbury, Connecticut.
Chalcocite
Formula: Cu2S
Habit: Striated microcrystals
Colour: Metallic blue
Description: Most copper sulfide here is bornite, small flattened siderite rhombs are striated and may look like chalcocite. A few microcrystal found, however, on quartz with malachite.
Reference: Miller, F. W. (circa 1986), Hydrothermal Quartz and Barite Veins in the Basalt of New Britain, Connecticut. Harvard University Mineralogical Museum Association.; David Busha collection.
Chalcopyrite
Formula: CuFeS2
Chrysocolla
Formula: Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Habit: massive encrustations on chalcopyrite
Colour: pale blue
Reference: Harold Moritz collection
Copper
Formula: Cu
Habit: arborescent microcrystals
Reference: Januzzi, Ronald E. (1976), Mineral Localities of Connecticut and Southeastern New York State. The Mineralogical Press, Danbury, Connecticut.
Covellite ?
Formula: CuS
Description: Bona-fide analyzed and labelled covellite from Connecticut is unknown though often claimed.
Reference: Januzzi, Ronald E. (1976), Mineral Localities of Connecticut and Southeastern New York State. The Mineralogical Press, Danbury, Connecticut.
Cuprite
Formula: Cu2O
Colour: red
Description: Secondary red crust/stains.
Reference: Januzzi, Ronald E. (1976), Mineral Localities of Connecticut and Southeastern New York State. The Mineralogical Press, Danbury, Connecticut.
Datolite
Formula: CaB(SiO4)(OH)
Devilline ?
Formula: CaCu4(SO4)2(OH)6 · 3H2O
Description: Januzzi (1976) claims it was characterized but provides no details or citation.
Reference: Januzzi, Ronald E. (1976), Mineral Localities of Connecticut and Southeastern New York State. The Mineralogical Press, Danbury, Connecticut.
Dolomite
Formula: CaMg(CO3)2
Dolomite var: Ferroan Dolomite
Formula: Ca(Mg,Fe)(CO3)2
Galena
Formula: PbS
Habit: cubic to slightly cuboctahedral, interpenetration twins very rare.
Colour: dark gray, some iridescent
Description: Crystals can reach several cm in groups to over 15 cm commonly embedded in barite and/or dolomite and associated with other metal sulfides like sphalerite and bornite.
Reference: Januzzi, Ronald E. (1976), Mineral Localities of Connecticut and Southeastern New York State. The Mineralogical Press, Danbury, Connecticut.
Goethite
Formula: α-Fe3+O(OH)
Gypsum
Formula: CaSO4 · 2H2O
Gypsum var: Satin Spar Gypsum
Formula: CaSO4 · 2H2O
Reference: Van King
Hematite
Formula: Fe2O3
Habit: Tabular to granular.
Colour: Specular black to red.
Description: Microcrystals on quartz or datolite in gas vesicles in basalt.
Reference: Miller, F. W. (circa 1986), Hydrothermal Quartz and Barite Veins in the Basalt of New Britain, Connecticut. Harvard University Mineralogical Museum Association. Harold Moritz collection.
'Heulandite subgroup'
Description: Crystals to around 1 cm in gas vesicles in basalt.
Reference: Miller, F. W. (circa 1986), Hydrothermal Quartz and Barite Veins in the Basalt of New Britain, Connecticut. Harvard University Mineralogical Museum Association.
'K Feldspar'
'K Feldspar var: Adularia'
Formula: KAlSi3O8
Laumontite
Formula: CaAl2Si4O12 · 4H2O
Description: Crystals in gas vesicles in basalt.
Reference: Miller, F. W. (circa 1986), Hydrothermal Quartz and Barite Veins in the Basalt of New Britain, Connecticut. Harvard University Mineralogical Museum Association.
'Limonite'
Formula: (Fe,O,OH,H2O)
Malachite
Formula: Cu2(CO3)(OH)2
Pectolite
Formula: NaCa2Si3O8(OH)
Reference: David Busha collection
Prehnite
Formula: Ca2Al2Si3O10(OH)2
Pyrolusite
Formula: Mn4+O2
Reference: Collected and IDed by Jeremy Zolan
Quartz
Formula: SiO2
Quartz var: Amethyst
Formula: SiO2
Habit: short prismatic to prismless
Colour: purple
Description: In fault veins usually as plates of parallel crystals grading to colorless quartz.
Reference: Januzzi, Ronald E. (1976), Mineral Localities of Connecticut and Southeastern New York State. The Mineralogical Press, Danbury, Connecticut.
Quartz var: Chalcedony
Formula: SiO2
Reference: Van King
Siderite
Formula: FeCO3
Sphalerite
Formula: ZnS
Habit: Massive
Colour: dark brown to black
Description: Cleavable masses associated with other metal sulfides, primarily galena.
Reference: Januzzi, Ronald E. (1976), Mineral Localities of Connecticut and Southeastern New York State. The Mineralogical Press, Danbury, Connecticut.

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Copper1.AA.05Cu
Group 2 - Sulphides and Sulfosalts
Bornite2.BA.15Cu5FeS4
Chalcocite2.BA.05Cu2S
Chalcopyrite2.CB.10aCuFeS2
Covellite ?2.CA.05aCuS
Galena2.CD.10PbS
Sphalerite2.CB.05aZnS
Group 4 - Oxides and Hydroxides
Cuprite4.AA.10Cu2O
Goethite4.00.α-Fe3+O(OH)
Hematite4.CB.05Fe2O3
Pyrolusite4.DB.05Mn4+O2
Quartz4.DA.05SiO2
var: Amethyst4.DA.05SiO2
var: Chalcedony4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Aragonite5.AB.15CaCO3
Aurichalcite5.BA.15(Zn,Cu)5(CO3)2(OH)6
Azurite5.BA.05Cu3(CO3)2(OH)2
Calcite5.AB.05CaCO3
Cerussite5.AB.15PbCO3
Dolomite5.AB.10CaMg(CO3)2
var: Ferroan Dolomite5.AB.10Ca(Mg,Fe)(CO3)2
Malachite5.BA.10Cu2(CO3)(OH)2
Siderite5.AB.05FeCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Anglesite ?7.AD.35PbSO4
Anhydrite7.AD.30CaSO4
Baryte7.AD.35BaSO4
Devilline ?7.DD.30CaCu4(SO4)2(OH)6 · 3H2O
Gypsum7.CD.40CaSO4 · 2H2O
var: Satin Spar Gypsum7.CD.40CaSO4 · 2H2O
Group 9 - Silicates
Analcime9.GB.05Na(AlSi2O6) · H2O
Chrysocolla9.ED.20Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Datolite9.AJ.20CaB(SiO4)(OH)
Laumontite9.GB.10CaAl2Si4O12 · 4H2O
Pectolite9.DG.05NaCa2Si3O8(OH)
Prehnite9.DP.20Ca2Al2Si3O10(OH)2
Unclassified Minerals, Rocks, etc.
'Amphibole Supergroup'-AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
'var: Byssolite'-AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
'Bitumen'-
'Heulandite subgroup'-
'K Feldspar'-
'var: Adularia'-KAlSi3O8
'Limonite'-(Fe,O,OH,H2O)

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Copper1.1.1.3Cu
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 2:1
Chalcocite2.4.7.1Cu2S
AmBnXp, with (m+n):p = 3:2
Bornite2.5.2.1Cu5FeS4
AmXp, with m:p = 1:1
Covellite ?2.8.12.1CuS
Galena2.8.1.1PbS
Sphalerite2.8.2.1ZnS
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
Group 4 - SIMPLE OXIDES
A2X
Cuprite4.1.1.1Cu2O
A2X3
Hematite4.3.1.2Fe2O3
AX2
Pyrolusite4.4.1.4Mn4+O2
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
XO(OH)
Goethite6.1.1.2α-Fe3+O(OH)
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Cerussite14.1.3.4PbCO3
Siderite14.1.1.3FeCO3
AB(XO3)2
Dolomite14.2.1.1CaMg(CO3)2
Group 16a - ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
Azurite16a.2.1.1Cu3(CO3)2(OH)2
Malachite16a.3.1.1Cu2(CO3)(OH)2
Aurichalcite16a.4.2.1(Zn,Cu)5(CO3)2(OH)6
Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
AXO4
Anglesite ?28.3.1.3PbSO4
Anhydrite28.3.2.1CaSO4
Baryte28.3.1.1BaSO4
Group 29 - HYDRATED ACID AND NORMAL SULFATES
AXO4·xH2O
Gypsum29.6.3.1CaSO4 · 2H2O
Group 31 - HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
(AB)5(XO4)2Zq·xH2O
Devilline ?31.6.1.1CaCu4(SO4)2(OH)6 · 3H2O
Group 54 - NESOSILICATES Borosilicates and Some Beryllosilicates
Borosilicates and Some Beryllosilicates with B in [4] coordination
Datolite54.2.1a.1CaB(SiO4)(OH)
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=3
Pectolite65.2.1.4aNaCa2Si3O8(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 74 - PHYLLOSILICATES Modulated Layers
Modulated Layers with joined strips
Chrysocolla74.3.2.1Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Group 77 - TECTOSILICATES Zeolites
Zeolite group - True zeolites
Analcime77.1.1.1Na(AlSi2O6) · H2O
Laumontite77.1.1.4CaAl2Si4O12 · 4H2O
Unclassified Minerals, Mixtures, etc.
'Amphibole Supergroup'-AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
'var: Byssolite'-AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Aragonite-CaCO3
'Bitumen'-
Dolomite
var: Ferroan Dolomite
-Ca(Mg,Fe)(CO3)2
Gypsum
var: Satin Spar Gypsum
-CaSO4 · 2H2O
'Heulandite subgroup'-
'K Feldspar'-
'var: Adularia'-KAlSi3O8
'Limonite'-(Fe,O,OH,H2O)
Quartz
var: Amethyst
-SiO2
var: Chalcedony-SiO2

List of minerals for each chemical element

HHydrogen
H MalachiteCu2(CO3)(OH)2
H AzuriteCu3(CO3)2(OH)2
H DatoliteCaB(SiO4)(OH)
H Goethiteα-Fe3+O(OH)
H GypsumCaSO4 · 2H2O
H Gypsum (var: Satin Spar Gypsum)CaSO4 · 2H2O
H Limonite(Fe,O,OH,H2O)
H Amphibole Supergroup (var: Byssolite)AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
H LaumontiteCaAl2Si4O12 · 4H2O
H PrehniteCa2Al2Si3O10(OH)2
H AnalcimeNa(AlSi2O6) · H2O
H Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
H PectoliteNaCa2Si3O8(OH)
H ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
H Aurichalcite(Zn,Cu)5(CO3)2(OH)6
H DevillineCaCu4(SO4)2(OH)6 · 3H2O
BBoron
B DatoliteCaB(SiO4)(OH)
CCarbon
C AragoniteCaCO3
C DolomiteCaMg(CO3)2
C SideriteFeCO3
C CalciteCaCO3
C MalachiteCu2(CO3)(OH)2
C AzuriteCu3(CO3)2(OH)2
C Dolomite (var: Ferroan Dolomite)Ca(Mg,Fe)(CO3)2
C CerussitePbCO3
C Aurichalcite(Zn,Cu)5(CO3)2(OH)6
OOxygen
O QuartzSiO2
O BaryteBaSO4
O AragoniteCaCO3
O DolomiteCaMg(CO3)2
O SideriteFeCO3
O CalciteCaCO3
O K Feldspar (var: Adularia)KAlSi3O8
O AnhydriteCaSO4
O Quartz (var: Amethyst)SiO2
O MalachiteCu2(CO3)(OH)2
O AzuriteCu3(CO3)2(OH)2
O DatoliteCaB(SiO4)(OH)
O Goethiteα-Fe3+O(OH)
O Dolomite (var: Ferroan Dolomite)Ca(Mg,Fe)(CO3)2
O GypsumCaSO4 · 2H2O
O Quartz (var: Chalcedony)SiO2
O Gypsum (var: Satin Spar Gypsum)CaSO4 · 2H2O
O Limonite(Fe,O,OH,H2O)
O PyrolusiteMn4+O2
O Amphibole Supergroup (var: Byssolite)AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
O HematiteFe2O3
O LaumontiteCaAl2Si4O12 · 4H2O
O PrehniteCa2Al2Si3O10(OH)2
O AnalcimeNa(AlSi2O6) · H2O
O Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
O PectoliteNaCa2Si3O8(OH)
O CupriteCu2O
O CerussitePbCO3
O ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
O Aurichalcite(Zn,Cu)5(CO3)2(OH)6
O DevillineCaCu4(SO4)2(OH)6 · 3H2O
O AnglesitePbSO4
FFluorine
F Amphibole Supergroup (var: Byssolite)AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
F Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
NaSodium
Na AnalcimeNa(AlSi2O6) · H2O
Na PectoliteNaCa2Si3O8(OH)
MgMagnesium
Mg DolomiteCaMg(CO3)2
Mg Dolomite (var: Ferroan Dolomite)Ca(Mg,Fe)(CO3)2
AlAluminium
Al K Feldspar (var: Adularia)KAlSi3O8
Al Amphibole Supergroup (var: Byssolite)AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Al LaumontiteCaAl2Si4O12 · 4H2O
Al PrehniteCa2Al2Si3O10(OH)2
Al AnalcimeNa(AlSi2O6) · H2O
Al Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Al ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
SiSilicon
Si QuartzSiO2
Si K Feldspar (var: Adularia)KAlSi3O8
Si Quartz (var: Amethyst)SiO2
Si DatoliteCaB(SiO4)(OH)
Si Quartz (var: Chalcedony)SiO2
Si Amphibole Supergroup (var: Byssolite)AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Si LaumontiteCaAl2Si4O12 · 4H2O
Si PrehniteCa2Al2Si3O10(OH)2
Si AnalcimeNa(AlSi2O6) · H2O
Si Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Si PectoliteNaCa2Si3O8(OH)
Si ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
SSulfur
S BaryteBaSO4
S AnhydriteCaSO4
S ChalcopyriteCuFeS2
S GalenaPbS
S GypsumCaSO4 · 2H2O
S Gypsum (var: Satin Spar Gypsum)CaSO4 · 2H2O
S ChalcociteCu2S
S BorniteCu5FeS4
S SphaleriteZnS
S DevillineCaCu4(SO4)2(OH)6 · 3H2O
S AnglesitePbSO4
S CovelliteCuS
ClChlorine
Cl Amphibole Supergroup (var: Byssolite)AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Cl Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
KPotassium
K K Feldspar (var: Adularia)KAlSi3O8
CaCalcium
Ca AragoniteCaCO3
Ca DolomiteCaMg(CO3)2
Ca CalciteCaCO3
Ca AnhydriteCaSO4
Ca DatoliteCaB(SiO4)(OH)
Ca Dolomite (var: Ferroan Dolomite)Ca(Mg,Fe)(CO3)2
Ca GypsumCaSO4 · 2H2O
Ca Gypsum (var: Satin Spar Gypsum)CaSO4 · 2H2O
Ca LaumontiteCaAl2Si4O12 · 4H2O
Ca PrehniteCa2Al2Si3O10(OH)2
Ca PectoliteNaCa2Si3O8(OH)
Ca DevillineCaCu4(SO4)2(OH)6 · 3H2O
TiTitanium
Ti Amphibole Supergroup (var: Byssolite)AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Ti Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
MnManganese
Mn PyrolusiteMn4+O2
FeIron
Fe SideriteFeCO3
Fe ChalcopyriteCuFeS2
Fe Goethiteα-Fe3+O(OH)
Fe Dolomite (var: Ferroan Dolomite)Ca(Mg,Fe)(CO3)2
Fe Limonite(Fe,O,OH,H2O)
Fe HematiteFe2O3
Fe BorniteCu5FeS4
CuCopper
Cu MalachiteCu2(CO3)(OH)2
Cu AzuriteCu3(CO3)2(OH)2
Cu ChalcopyriteCuFeS2
Cu CopperCu
Cu ChalcociteCu2S
Cu BorniteCu5FeS4
Cu CupriteCu2O
Cu ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Cu Aurichalcite(Zn,Cu)5(CO3)2(OH)6
Cu DevillineCaCu4(SO4)2(OH)6 · 3H2O
Cu CovelliteCuS
ZnZinc
Zn SphaleriteZnS
Zn Aurichalcite(Zn,Cu)5(CO3)2(OH)6
BaBarium
Ba BaryteBaSO4
PbLead
Pb GalenaPbS
Pb CerussitePbCO3
Pb AnglesitePbSO4

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: 2901656
East Berlin Formation

Age: Early Jurassic (174.1 - 201.3 Ma)

Stratigraphic Name: East Berlin Formation

Description: Maroon siltstone, silty and sandy shale, and fine-grained silty sandstone, generally well laminated and commonly well indurated, alternating with dark fissile shale; dolomitic carbonate common in cement, concretions, and thin argillaceous laminae. Local arkose; grades eastward into coarse conglomerate close to eastern border fault. The East Berlin Formation of the Hartford basin contains eight facies: trough cross-bedded sandstones, horizontally stratified sandstones, interbedded sandstones and mudrocks, ripple cross-laminated siltstones, black shales, stratified mudrocks, disrupted shales, and disrupted mudstones. These facies are interpreted as a continental depositional system and are divided into two assemblages. Sandflat/alluvial plain facies assemblage (sandstones and siltstones) is composed of sheet-flood deposits. The lacustrine assemblage (shales and mudrocks) represents a saline lake-playa system (Gierlowski-Kordesch and Rust, 1994).

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. Secondary unit description per CT006. 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:{siltstone,shale}, Minor:{sandstone}, Incidental:{conglomerate, dolostone, arkose}

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

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Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Gray, Norman H. (1982): Copper Occurrences In The Hartford Basin Of Northern Connecticut. In Guidebook for Fieldtrips in Connecticut and South Central Massachusetts, New England Intercollegiate Geological Conference, 74th Annual Meeting, Connecticut Department Of Environmental Protection Guidebook No. 5, pp. 195-211.
Hubert, John F., Paul E. Feshbach-Meriney and Michael A. Smith. (1992). The Triassic-Jurassic Hartford Rift Basin, Connecticut And Massachusetts: Evolution, Sandstone Diagenesis, And Hydrocarbon History. AAPG Bulletin, vol. 76, no. 11.
Scovil, Jeffrey. (2008): Minerals of the Ellis Street Extension Road Cut, Route 72, New Britain, Connecticut. Rocks & Minerals, vol. 83, no. 2, pp. 152-160.

Localities in this Region
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