Ah horizons and Chernozemic order

Does the Ah (/Ap) horizon need to be > 10 cm thick in order for the soil to be classified as Chernozem ? As the table in the lab manual doesn't specify, but the slides say it must.

E.g., would this soil be a Chernozem or a Brunisol?

Ah (0-9 cm)
Bm (9-22 cm)
Ck1 (22-40)
Ck2 (40+ cm)

Yes, it has to be thicker than 10 cm and they also have to specify characteristics such as base saturation higher than 80% for it to be a chernozemic Ah and therefore a Chernozem, because that is not specified, the soil in this example is a Brunisol.

Cool, thanks for the answer