Which of the following is NOT a hydric soil indicator?

The correct choice identifies an indicator that does not qualify as a hydric soil indicator. Hydric soils are defined as those that are formed under conditions of saturation, flooding, or ponding long enough during the growing season to develop anaerobic conditions in the upper part of the soil profile.

In this case, a highly organic layer, such as S3, suggests significant organic matter accumulation, commonly found in peat or muck soils. While organic soils can be hydric, the specific designation of S3 is not an indicator that characterizes hydric conditions since it does not necessarily reflect the changes or features associated with saturation or reduced oxygen conditions over time.

On the other hand, the other options represent indicators associated with hydric soils. An A12 thick dark surface indicates a rich organic layer typically formed under wetland conditions. The A11 depleted below dark surface shows evidence of gleying, indicating the presence of hydric conditions. Similarly, the F3 depleted matrix is indicative of anaerobic conditions due to saturation, resulting in the depletion of iron and other oxides. Each of these indicators reflects soil processes influenced by prolonged moisture, which is integral to defining hydric soils.