Re: mollic epipedon definition

Can anyone tell me if they have any soils that use these exceptions to the standard color rule for mollic epipedon? If so, how do you determine the calcium carbonate equivalent in the field?

b. A fine-earth fraction that has a calcium carbonate
equivalent of 15 to 40 percent and colors with a value and
chroma of 3 or less, moist; or

c. A fine-earth fraction that has a calcium carbonate
equivalent of 40 percent or more and a color value of 5 or
less, moist; and