Diagnostic horizons are used to classify soils in Soil Taxonomy. Explain the difference between a diagnostic horizon (such as an argillic horizon) and a genetic horizon designation (such as a Bt1...

Diagnostic horizons are used to classify soils in Soil Taxonomy. Explain the difference between a diagnostic horizon (such as an argillic horizon) and a genetic horizon designation (such as a Bt1 horizon). Give a field example of a diagnostic horizon that contains several genetic horizon designations.