extreme vertical exaggeration and cross-section is generalized |
Coastal Plain Region Topics
In the coastal plain, as shown dissected to the left, an aquifer is typically composed of one to several layers of
eastward thickening, permeable sands or limestone (the stippled yellow pattern)
split by discontinuous, clay-rich materials. Confining units, consisting of clay-rich
sediments, exist above and below an aquifer (the gray pattern).
These confining units are more continuous clay layers and separate the aquifers. The surficial or unconfined aquifer overlies all
the confined aquifers in the coastal plain. Igneous and metamorphic bedrock drops off dramatically toward the east and
is shown at the base of the sedimentary materials.
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