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Wesley Hills, Town of Ramapo, Rockland Co., New York, USAi
Regional Level Types
Wesley HillsGroup of Hills
Town of Ramapo- not defined -
Rockland Co.County
New YorkState

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Latitude & Longitude (WGS84):
41° 10' 9'' North , 74° 5' 1'' West
Latitude & Longitude (decimal):
Locality type:
Group of Hills
Nearest Settlements:
Wesley Hills5,935 (2017)1.6km
Pomona3,103 (2017)3.4km
Viola6,868 (2017)3.6km
Mount Ivy6,878 (2017)4.5km
New Hempstead5,312 (2017)4.7km

The village of Wesley Hills is a newly formed village (1982) in Rockland Co., NY. It is directly north of Suffern and is in the Suffern zipcode. Wesley Hills has several residential construction sites on the Ladentown basalt, which according to most geologists is a northern interrupted extension of the Watchung basalt of N.J. Several traprock minerals have been found here.

Historically, the Ladentown basalt has been one of the least known bodies of eruptive rock in the Newark Basin. This is mainly due to poor exposure. The most extensive study of the flows and the associated diabase is found in Ratcliffe (1988). Although there are strong similarities between the chemistry of the Ladentown flows and those of the Orange Mountain basalt a few miles south in New Jersey it is not certain that they were ever contiguous.

At the northern end of the Palisades diabase the intrusive ceases to be conformable with the sedimentary rocks and cuts westward across strike and upward through the section. At its western end the diabase, now fine grained and vesicular, is intrusive into the Ladentown basalt flows. Nearby the intrusive rocks crosscut conglomerate beds containing basalt clasts. In addition the diabase chemistry better approximates that of the younger Preakness basalt than the Ladentown flows. Therefore, it is unknown whether the Ladentown flows originated from a local vent or even if the diabase ever breached the surface to produce any surficial flows at Ladentown.

Another factor that secondary mineral development and alteration at Ladentown might shed light on is the nature of fluid circulation. Steckler, et al. (1993) proposed that hydrothermal circulation in the Newark Basin consisted of formation brines driven by artesian pressure. The recharge part of the system, , and therefore cooler down-welling part, is in the vicinity of the Ramapo (border) fault, just west of then Ladentown flows. Cooler and much less saline fluids might be expected to limit secondary mineral development. It is possible that the later pulse of the Palisaids diabase magma that intrudes the Ladentown flows provided enough heat to drive local fluid circulation.

As is the case in many suburban areas construction sites will continue to provide sporadic exposures.

Regions containing this locality

North America PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

11 valid minerals.

Detailed Mineral List:

Formula: Na(AlSi2O6) · H2O
Colour: white
Reference: Hershel Friedman collection (2007)
Formula: CaSO4
Description: Dissolved Anhydrite Casts, mostly replaced by Prehnite
Reference: Hershel Friedman (2007)
Formula: CaCO3
Reference: Personally observed by Hershel Friedman, 2009
Formula: K(Mg,Fe2+)Fe3+(Si4O10)(OH)2
Colour: green
Reference: Hershel Friedman collection (2007). Confirmed by Michael Hawkins, NY State Museum, 2008.
Colour: colorless, white, brown
Reference: Hershel Friedman collection (2007). Confirmed by Michael Hawkins, NY State Museum, 2008.
Formula: Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Colour: green
Description: small green blebs usually associated with prehnite
Reference: Hershel Friedman collection (2007). Confirmed by Michael Hawkins, NY State Museum, 2008.
Formula: CaB(SiO4)(OH)
Reference: Hershel Friedman collection (2009)
'Heulandite subgroup'
Colour: white
Reference: Hershel Friedman collection (2008)
Formula: Na2Al2Si3O10 · 2H2O
Reference: Hershel Friedman collection (2008)
Formula: NaCa2Si3O8(OH)
Reference: Hershel Friedman collection (2008)
Formula: Ca2Al2Si3O10(OH)2
Colour: green, white
Reference: Hershel Friedman collection (2007). Confirmed by Michael Hawkins, NY State Museum, 2008.
Formula: SiO2
Reference: Personally observed by Hershel Friedman, 2009
Quartz var: Agate
Reference: Personally observed by Hershel Friedman, 2009
Quartz var: Amethyst
Formula: SiO2
Reference: Personally observed by Hershel Friedman, 2009
Quartz var: Chalcedony
Formula: SiO2
Reference: Personally observed by Hershel Friedman, 2009
'Stilbite subgroup'
Reference: Hershel Friedman collection (2008)
Formula: (K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Reference: Hershel Friedman collection (2007). Confirmed by Michael Hawkins, NY State Museum, 2008.

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
var: Agate4.DA.05SiO2
var: Amethyst4.DA.05SiO2
var: Chalcedony4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Group 9 - Silicates
Analcime9.GB.05Na(AlSi2O6) · H2O
Chrysocolla9.ED.20Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Natrolite9.GA.05Na2Al2Si3O10 · 2H2O
Stilpnomelane9.EG.40(K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Unclassified Minerals, Rocks, etc.
'Heulandite subgroup'-
'Stilbite subgroup'-

List of minerals arranged by Dana 8th Edition classification

Group 54 - NESOSILICATES Borosilicates and Some Beryllosilicates
Borosilicates and Some Beryllosilicates with B in [4] coordination
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=3
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
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
Group 74 - PHYLLOSILICATES Modulated Layers
Modulated Layers with joined islands
Stilpnomelane74.1.1.1(K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
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
Group 77 - TECTOSILICATES Zeolites
Zeolite group - True zeolites
Analcime77.1.1.1Na(AlSi2O6) · H2O
Natrolite77.1.5.1Na2Al2Si3O10 · 2H2O
Unclassified Minerals, Mixtures, etc.
'Heulandite subgroup'-
var: Agate
var: Amethyst-SiO2
var: Chalcedony-SiO2
'Stilbite subgroup'-

List of minerals for each chemical element

H PrehniteCa2Al2Si3O10(OH)2
H CeladoniteK(Mg,Fe2+)Fe3+(Si4O10)(OH)2
H AnalcimeNa(AlSi2O6) · H2O
H ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
H Stilpnomelane(K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
H NatroliteNa2Al2Si3O10 · 2H2O
H PectoliteNaCa2Si3O8(OH)
H DatoliteCaB(SiO4)(OH)
B DatoliteCaB(SiO4)(OH)
C CalciteCaCO3
O PrehniteCa2Al2Si3O10(OH)2
O CeladoniteK(Mg,Fe2+)Fe3+(Si4O10)(OH)2
O AnhydriteCaSO4
O AnalcimeNa(AlSi2O6) · H2O
O ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
O Stilpnomelane(K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
O NatroliteNa2Al2Si3O10 · 2H2O
O PectoliteNaCa2Si3O8(OH)
O DatoliteCaB(SiO4)(OH)
O QuartzSiO2
O Quartz (var: Chalcedony)SiO2
O Quartz (var: Amethyst)SiO2
O CalciteCaCO3
Na AnalcimeNa(AlSi2O6) · H2O
Na Stilpnomelane(K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Na NatroliteNa2Al2Si3O10 · 2H2O
Na PectoliteNaCa2Si3O8(OH)
Mg CeladoniteK(Mg,Fe2+)Fe3+(Si4O10)(OH)2
Mg Stilpnomelane(K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Al PrehniteCa2Al2Si3O10(OH)2
Al AnalcimeNa(AlSi2O6) · H2O
Al ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Al Stilpnomelane(K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Al NatroliteNa2Al2Si3O10 · 2H2O
Si PrehniteCa2Al2Si3O10(OH)2
Si CeladoniteK(Mg,Fe2+)Fe3+(Si4O10)(OH)2
Si AnalcimeNa(AlSi2O6) · H2O
Si ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Si Stilpnomelane(K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Si NatroliteNa2Al2Si3O10 · 2H2O
Si PectoliteNaCa2Si3O8(OH)
Si DatoliteCaB(SiO4)(OH)
Si QuartzSiO2
Si Quartz (var: Chalcedony)SiO2
Si Quartz (var: Amethyst)SiO2
S AnhydriteCaSO4
K CeladoniteK(Mg,Fe2+)Fe3+(Si4O10)(OH)2
K Stilpnomelane(K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Ca PrehniteCa2Al2Si3O10(OH)2
Ca AnhydriteCaSO4
Ca Stilpnomelane(K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Ca PectoliteNaCa2Si3O8(OH)
Ca DatoliteCaB(SiO4)(OH)
Ca CalciteCaCO3
Fe CeladoniteK(Mg,Fe2+)Fe3+(Si4O10)(OH)2
Fe Stilpnomelane(K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Cu ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O

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

Late Triassic
201.3 - 237 Ma

ID: 2764404
Ladentown diabase and baslatic lava

Age: Late Triassic (201.3 - 237 Ma)

Stratigraphic Name: Ladentown Diabase

Description: part of Newark Group 0-7000 ft. (0-2100 m).

Comments: Original map source: NYS Museum, NYS Geological Survey, NYS Museum Technology Center, 1999, bedrock geology of NYS data is distributed in ARC/INFOr EXPORT format (with '.e00' extension) in 5 seperate files based on 1970 printed map sheets, scale 1:250,000.

Lithology: Major:{basalt}

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]

201.3 - 251.902 Ma

ID: 3186144
Mesozoic sedimentary rocks

Age: Triassic (201.3 - 251.902 Ma)

Comments: Newark Graben System; Newark-Gettysburg Basin

Lithology: Shale,conglomerate,quartz-feldspar sandstone,siltstone,limestone

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


Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Discovered and personally observed by Hershel Friedman, 2007-2011.
Ratcliffe, N.M., 1988, Reinterpretation of the relationship of the western extension of the Palisades sill to the flows at Ladentown, New York, based on new core data, in Froelich, A.J., and Robinson, G.R., eds., Studies of the early Mesozoic basins of the eastern United States: U.S. Geological Survey Bulletin 1776, p. 113–135.
Steckler, M. S., Omar, G. I., Karner, G. D. & Kohn, B. P. 1993 Pattern of hydrothermal circulation within the Newark Basin from fission-track analysis. Geology 21, 735–738

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