Guidebook: Columbia Deposits Of Delaware
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Date
1976-05
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Newark, DE: Delaware Geological Survey, University of Delaware
Abstract
The Columbia sediments of Delaware cover almost all of the surface of the Coastal Plain portion of the State. A major unconformity separates these predominantly sandy materials from the underlying rocks of the Coastal Plain. As it includes the materials closest to the surface in most places, the Columbia has great practical importance in Delaware. In addition to the morphology and soils which are largely dictated by the Columbia, it holds about 90 percent of the State's groundwater supplies, is the geologic foundation for most construction, and yields essentially all of the sand and gravel mined here.
Description
Keywords
Columbia deposits, Columbia sediments, Coastal Plain, sand, gravel