MassGIS logo

MassGIS maintains a comprehensive, statewide database of spatial information for mapping and analysis supporting emergency response, environmental planning and management, transportation planning, economic development, and transparency in state government operations.

Visit the MassGIS website

Browse all MassGIS data layers

Other Access

The information on this page (the dataset metadata) is also available in these formats.

JSON RDF

via the DKAN API

MassGIS Data: Surficial Geology (1:250,000)

October 1999

Thi layer is a statewide surficial geology datalayer showing the location of sand and gravel deposits.

Download this layer
Shapefile and ArcGIS 10 layer files
Sample of Surficial Geology (1:250,000)

MassGIS has produced a statewide surficial geology datalayer showing the location of sand and gravel deposits. Originally the data were divided into three panels- west, east, and southeast that correspond to the U.S. Geological Survey 1:250,000 map sheets that were used as a basemap. This datalayer is very generalized when compared to the other MassGIS data. MassGIS uses the surficial geology data only to produce volume or area measurements over a large region, e.g. a drainage basin. It is not accurate for site specific analysis.

As part of a major data development effort, the datalayer has been greatly enhanced. The data include areas of fine-grained deposits and floodplains. For the original southeast panel, the 1:250,000 Providence, RI sheet, large sand deposits have also been delineated. Additionally, contour lines indicating depth of sand and gravel deposits have also been added.

The layer is named SURFGEO250K_POLY.

Manuscript

This datalayer was interpreted and compiled by Byron Stone, a USGS geologist. A set of USGS 1:250,000 film basemaps were enlarged onto stable based film at a scale of 1:125,000. The data were then recompiled from a set of 1:25,000 quadrangle sheets onto the 1:125,000 basemap. This manuscript does not precisely register with the standard MassGIS basemap.

Methodology

For the original datalayer production, the tics of the Transverse Mercator manuscripts were projected into the MassGIS State Plane coordinates before digitizing began. Polygons were labeled and a checkplot was made at manuscript scale.The enhancement, also interpreted and compiled by Byron Stone, was completed in the fall of 1992. With the enlarged maps as basemaps, the fine-grained deposits, floodplains and contours were drafted onto film. All digitizing was completed by MassGIS from these overlays and subsequently, the linework was transformed and projected into state plane coordinates. As with the original manuscripts, these overlays do not precisely register with the MassGIS basemap. Plots were made at a scale of 1:125,000 and compared to the original manuscripts. The coverages were clipped to the 1:100,000 coastline.

In October 1999 this layer was moved from the BASIN library to WATRSHD2 when MassGIS received additional data from Pete Steeves of the USGS office in Northborough, Mass., that completed the entire extent of all watersheds that cover Massachusetts. At the same time the layer was edited to remove old county lines that remained from a previous tiling scheme.

Attributes

The layer's polygon attribute table has the following items:
CODE 1 - sand and gravel deposits
  2 - till or bedrock
  3 - sandy till over sand
  4 - end moraines
  5 - large sand deposits where distinguished from sand and gravel deposits
  6 - fine-grained deposits
  7 - floodplain alluvium
AREA_ACRES Area of the polygon in acres
RANGE Range of depth of deposit in feet for code = 1 or 5 in Massachusetts
 

Maintenance

MassGIS is managing this datalayer. No updates are planned. Also see the layer Surficial Geology (1:24,000).

Last Updated 6/12/2014

Items

Contributor
Modified Date
2017-12-22
Release Date
2017-12-22
Identifier
6d35291e-c469-4036-878d-c4b72090178e
Spatial / Geographical Coverage Location
Massachusetts
License
Author
MassGIS
Contact Name
MassGIS
Contact Email
Public Access Level
Public
Data Quality
False
Content Type
Language
English (United States)