| Basin-Fill Unconsolidated Aquifers | |
| Unconsolidated
aquifers also come in four distinct variations, but the principal
unconsolidated aquifer that underlies the San Luis Obispo area is
known as a basin-fill unconsolidated sand and gravel aquifer. Basin-fill
(or valley-fill) aquifers were deposited in depressions formed by
faulting or erosion or both. Fine-grained deposits of silt and clay
form local confining units in these aquifers, and thick sequences
of the unconsolidated deposits become more compact and less permeable
with depth.
California Coastal Basin-Fill Aquifers
Courtesy of USGS Aquifer Basics, http://capp.water.usgs.gov/aquiferBasics/calcobaq.html |
|
|
|
