A sand, crushed stone, and gravel pit operated by the New England Cement Block & Pipe Co.
Regions containing this locality
|North America Plate||Tectonic Plate|
Select Mineral List TypeStandard Detailed Strunz Dana Chemical Elements
List of minerals for each chemical element
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
|Silurian - Ordovician|
419.2 - 485.4 Ma
Age: Paleozoic (419.2 - 485.4 Ma)
Stratigraphic Name: Andover Granite
Comments: Part of Nashoba Zone (Silurian and Older Rocks). Andover Granite described as light-colored muscovite- and garnet-bearing, mostly gneissic granite. Includes a nongneissic component that is apparently younger than main mass (Hansen, 1956; Castle, 1964). Includes rocks previously assigned to Acton Granite of Hansen (1956) that probably belong to Andover's older phase. Text of report states that gneissic granite is dated at 450 to 445 Ma; younger phase of granite and pegmatite is dated at 415 to 410 Ma. Table 13 reports Rb-Sr whole rock ages of 446 +/-32 Ma (Zartman and Naylor, 1984), 450 +/-23 Ma (Handford and others, 1965), and 460 Ma (Schutts and others, 1976) for the older phase. Rb-Sr whole-rock ages for the younger phase are reported as 408 +/-22 Ma (Zartman and Naylor, 1984), and 415 Ma (Hill and others, 1984). Age in report is Ordovician and Silurian (Wones and Goldsmith, 1991) 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 Original map source: Unpublished Digital Geologic Map of Massachusetts received from Rudi Hon of Boston College in 1998; based on the 1983 USGS paper version (MA002).
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. 
541 - 1000 Ma
|Neoproterozoic crystalline metamorphic rocks|
Age: Neoproterozoic (541 - 1000 Ma)
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.