ledge rock

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The hard, solid rock at the earth’s surface or underlying surface soil; can be utilized as a firm foundation for a building.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
The site should be relatively flat to accommodate the large pads that are needed and should have a minimal amount of ledge rock, groundwater, or peat with soil ground.
We used ledge rock around the edge to provide a natural appearance.