Digital Data for Surficial Materials Maps
This dataset contains point data describing the textures of surficial sediments, independent of interpretations regarding their origin, mapped at a scale of 1;24,000. The Maine Geological Survey used this dataset to produce Surficial Materials Maps. Thickness of gravel, sand, silt, clay, and diamicton is shown. Data comes from auger holes, test pits, well logs, test borings, and gravel pits. Point data was compiled and digitized by the Maine Geological Survey from data compiled on USGS 7.5' quadrangle bases. The point attribute table contains information on the type of data point and, where appropriate, depth to bedrock, depth to water table, well yield, and/or material type and thickness.
Depth to bedrock data from the seismic line dataset are also shown on surficial materials maps. This dataset contains line data describing the results of 1-channel and 12-channel seismic refraction studies mapped at a scale of 1:24,000.
The digital data may not include information from the most recently published surficial materials maps. This data will be updated periodically but may be out of step briefly with published maps. The user should check the source attributes associated with the surficial materials data (points/lines/polygons) and verify that the digital data reflects the current published map for the quadrangle. The user can view the most recently published maps or check the source for the cited open-file map in the Bibliography of Maine Geology by searching for the open-file number (e.g. 04-93) in the keyword search source field.
Instructions for Downloading Digital Surficial Materials Data
- Using a web browser, go to the Maine Office of GIS Data Catalog. A topical listing of digital data layers will appear. Scroll down to the section titled Geological and geophysical.
- For surficial materials, choose the data layer named Surficial materials data.
- For seismic data, choose the data layer named Seismic lines.
- Click on the icons in the appropriate "Download" column to:
- View metadata.
- Download a .zip file of the shapefile.
- Download a .kmz file to view the data using Google Earth.
Last updated on November 9, 2012