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17.2 Characteristics of Gypsic and Petrogypsic Horizons
From an examination of 133 OSDs, the average depth to the gypsic horizon was
34 cm, ranging from 0 to 112 cm (data not reported). The average thickness of the
gypsic horizon was 8 cm, with a range of 15 (minimum required) to 178 cm.
Figure
17.1
shows soils containing gypsic and petrogypsic horizons from the
White Sands Missile site, NM.
Gypsic horizons most commonly have a loamy texture (Fig.
17.2
). Silt is the
dominant separate, averaging 44 % (Table
17.1
). Gypsic horizons have a low bulk
Fig. 17.1
A Leptic Haplogypsids with a gypsic horizon (
top
) and a Typic Petrogypsids with a
petrogypsic horizon (
bottom
), White Sands, New Mexico (Photos compliments of Dr. C. Monger)
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