ACID SULFATE SOILS - Sawgal.umd.edu - University of Maryland
ACID SULFATE SOILS - Sawgal.umd.edu - University of Maryland
ACID SULFATE SOILS - Sawgal.umd.edu - University of Maryland
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The soil pr<strong>of</strong>ile pictured below with S and Fe data on subsequent pages was studied<br />
by Dan Wagner as part <strong>of</strong> his Ph.D. dissertation studies at the Burrough’s site,<br />
about 1 mile up the Potomac River from the Loyola Retreat House location. Here<br />
the entire cliff, except for some thin, presumed wind-deposited silts at the top, were<br />
in a cut terrace <strong>of</strong> the glauconitic Tertiary Nanjemoy formation.<br />
A 6 meter<br />
pr<strong>of</strong>ile in<br />
sulfidic,<br />
glauconitic<br />
Tertiary<br />
sediments on<br />
Potomac<br />
River cliff<br />
face studied<br />
by Wagner<br />
(1982).<br />
Oxidized<br />
zone is nearly<br />
3 meters deep<br />
with a<br />
sulfuric<br />
horizon with<br />
gypsum<br />
crystals at<br />
top <strong>of</strong> unoxidized<br />
zone. White<br />
shells occur<br />
in black<br />
sulfidic<br />
materials in<br />
un-oxidized<br />
zone.<br />
Surficial<br />
materials<br />
from lateral<br />
weathering<br />
were<br />
removed to<br />
show the<br />
pr<strong>of</strong>ile. The<br />
info here and<br />
in the next<br />
two pages are<br />
from a Power<br />
Point<br />
presentation<br />
by Fanning et al. which fed into a paper, Fanning et al. (2010), published in Geoderma.<br />
29
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