Clay content ranges from 27 to 42 percent. Rock fragment content ranges from 1 to 10 percent. Reaction ranges from neutral to moderately alkaline. The 2C or 2Cg horizon has hue of 10YR, 2.5Y, or 5Y, value of 4 to 6, and chroma of 1 to 6. Texture and rock fragment content are similar to the 2B horizon.
Reaction is slightly alkaline or moderately alkaline and contains carbonates.
There are no other series in this family. Competing series may change as they are updated to the 8th Edition of Keys to Soil Taxonomy. The Havana series has not been updated to the 8th Edition of Keys to Soil Taxonomy, but was a competing series to Mermill under previous taxonomic classification. Havana soils typically average less than 27 percent clay in the lower part of the series control section. Mermill soils are on lake plains, and less commonly on till plains of late Wisconsin age.