Regosolic soil order questions

Angelo Be clear on the diagnostic horizons. e.g. Chernozemic Ah > 10 cm BUT also has between 1-17% organic C, C:N ratio < 17:1, base saturation > 80% and Ca2+ is the dominant cation. Be careful not to jump to conclusion that a soil is Chernozem just because the Ah is > 10 cm. Use the other clues given in the question re. the site description.

In this class we focus on soil order. We did give you one example in the lecture notes (lecture #31) of Great Group for Chernozems (Brown Chernozem, Dark Brown Chernozem, Black Chernozem). Thus, combinations such as a Regosolic Cryosol exist (e.g. your example of a soil lacking a B horizon but with permafrost within 1 m of the soil surface). Note Organic soils also do not have a B horizon. However, you are correct that the diagnostic feature of a Regosol is the lack of B horizon. Again, use the information provided in the description portion of the exam (e.g. located on a floodplain such as the example question 7a) on the sample final exam posted in the wiki).