Indicating Diagnostic Horizons

Hey,

I classifed this example as a Regesolic order and the diagnostic horizon is there is no B horizon present in this soil sample.

Would this be correct?

Yes, that is correct. This soil has no B horizon and it is a Regosol.

Additional info that would confirm this decision (ie that this is a Regolos) are: -presence of Ahb (ie buried horizon) at depth of the soil profile, and -location of this soil on a floodplain; hence, burial of the original Ah happened due to flooding event