Geology Reference
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drinking water and the o 2.3 mgL 1 limit subsequently suggested for the
protection of aquatic life.
To the west of the San Joaquin River (Figure 5), selenium in the soils is
believed to be of natural origin. During the Jurassic and Cretaceous
periods, there was deposition of marine sediments comprising sandstones,
shales, and conglomerates, including seleno-sulfides of iron (FeS 2 รพ FeSe 2 ).
Subsequent uplifting of these sediments produced the Coast Ranges and
Figure 5 The Kesterson effect: biogeochemical cycling of selenium in the Coast Ranges,
San Joaquin Valley, and Kesterson National Wildlife Refuge of California
(Reproduced with permission from ref 86, r Springer Verlag, 1994)
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