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Ledge Hill Quarry, Dracut, Middlesex Co., Massachusetts, USAi
Regional Level Types
Ledge Hill QuarryQuarry (Abandoned)
Dracut- not defined -
Middlesex Co.County

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Map Views Showing Location of Ledge Hill Quarry

Ledge Hill Quarry, Dracut, Middlesex Co., Massachusetts, USA
Map Views Showing Location of Ledge Hill Quarry

Ledge Hill Quarry, Dracut, Middlesex Co., Massachusetts, USA
Map Views Showing Location of Ledge Hill Quarry

Ledge Hill Quarry, Dracut, Middlesex Co., Massachusetts, USA
Latitude & Longitude (WGS84):
42° 39' 52'' North , 71° 20' 43'' West
Latitude & Longitude (decimal):
Locality type:
Quarry (Abandoned) - last checked 2019
Nearest Settlements:
Dracut28,831 (2017)3.6km
Lowell110,699 (2017)4.2km
Tyngsboro11,366 (2017)6.6km
Chelmsford33,925 (2017)7.4km
Pelham12,676 (2017)7.9km

Ledge Hill, off Mammoth Road, was the source of stone for many Lowell mill and factory foundations.

Regions containing this locality

North America PlateTectonic Plate

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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

Wenlock - Llandovery
427.4 - 443.8 Ma

ID: 2771368
Ayer Granite

Age: Silurian (427.4 - 443.8 Ma)

Stratigraphic Name: Ayer Granite

Description: Granite to tonalite, partly porphyritic; locally gneissic, locally muscovitic; may include rocks older than Silurian; intrudes Sb and So. Ayer Granite is divided into the Clinton facies and the Devens-Long Pond facies (Gore, 1976). In addition, there are some masses not assigned to either facies that intrude Berwick Formation west and northwest of Lawrence, and that intrude Paxton and Oakdale Formations south of Worcester and west of probable southern continuation of Wekepeke fault. Radiometric ages obtained for facies of Ayer pose problems in assigning ages to unfossiliferous sedimentary rocks they intrude. Clinton facies has a well-defined U-Pb zircon age of 433 +/-5 Ma (Zartman and Naylor, 1984) that authors cite as Early Silurian; Devens-Long Pond facies has a similar age. This age greatly compresses the time available for deposition, burial, deformation, and metamorphism of Berwick and Paxton if these units are truly Silurian. Some of the Ayer not assigned to a facies may have been more properly correlated with Early Devonian Chelmsford Granite and muscovite-biotite granite at Millstone Hill. Bodies south of Worcester may be more properly correlated with Canterbury Gneiss of CT, which lies on strike with Ayer and has Early Devonian age of 329 +/-9 Ma (Zartman and Naylor, 1984). Zartman and Naylor (1984) believe Ayer Granite has same age range as Newburyport Complex. It is quite possible, based on textural and mineralogical differences that the two facies should be separate units, representing different magmatic events (Wones and Goldsmith, 1991).

Comments: Part of Merrimack Belt (Silurian, Devonian and Pennsylvanian Rocks). Secondary unit description per MA007. Original map source: Unpublished Digital Geologic Map of Massachusetts received from Rudi Hon of Boston College in 1998; based on the 1983 USGS paper version (MA002).

Lithology: Major:{granite,tonalite}

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]

541 - 1000 Ma

ID: 3187301
Neoproterozoic crystalline metamorphic rocks

Age: Neoproterozoic (541 - 1000 Ma)

Lithology: Amphibolite grade 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


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Coburn, Silas R. - History of Dracut, Massachusetts (1922)

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