I. Rolled Rims
          Surface Finish
               a) Smooth
          Decoration
               a) None
               Powell Plain

          Surface Finish
               a) Smoothed (usually) to polished
          Decoration
               a) Rim - generally plain
               b) Shoulder-deep, broad trailing
                              a) Lineate horizontal
                              b) Curvilinear chevron
                              c) Lineate chevron
               Ramey Broad Trailed

II. "S" Shaped Rims
          Surface finish
               a) Smoothed to "polished"
          Decoration
               a) Rim- cord impressed (usually 3-4 lines)
                              a) Lineate horizontal
                                        a) Superimposed chevrons
                              b) Crosshatching (unusual)
               b) Rim- incised
                              a) Similar to cord impressed
                              b) Vertical incisions on interior of rim
                              c) Crosshatching or diagonals on lip
               c) Shoulder - broad trailed, incised, cord impressed
                              a) Lineate horizontal
                              b) Lineate chevron
               Judson Composite, Judson Variety

          Surface finish
               a) Smoothed or cord marked smoothed
          Decoration
               a) Lip and exterior lip margin - incised
                              a) Diagonals
                              b) Crosshatching
                              c) Lines with finger or fingernail impression on margin
               b) Rim exterior
                              a) None
               c) Rim interior
                              a) Vertical incisions (unusual)
               d) Shoulder - narrow trailed
                              a) Lineate horizontal
               Judson Composite, Southbend Variety

          Surface finish
               a) Smoothed
          Decoration
               a) Rim - plain
               b) Shoulder - plain or narrow trailed
                              a) Lineate chevron
                              b) Curvilinear
               Judson Composite, Lincoln Variety

III. Everted Rims, Linden Type
          Surface Finish
               a) Smoothed to "polished"
          Decoration
               a) Rims- plain
               b) Shoulder - plain or broad trailed
                              a) Lineate Chevron
                              b) Lineate Horizontal
                              c) Curvilinear
                              d) Lineate Meander
                              e) Triangle Punctate (unusual)
               Linden Everted Rim, Linden Variety

          Surface finish
               b) Smoothed (usually)
          Decoration
               a) Lip and lip margin - incision
                              a) "Incised" punctates
                              b) Crosshatching
                              c) Diagonal lines
                              d) Parallel lines
               b) Shoulder- plain or trailed
                              a) Lineate horizontal
                              b) Lineate chevron
                              c) Curvilinear
                              d) Lineate meander
               Linden Everted Rim, Nicollet Variety

          Surface finish
               a) Smoothed (usually)
          Decoration
               a) Interior rim - cord impressed or incised
                              a) Parallel vertical lines
               b) Shoulder - trailed or incised
                              a) Lineate chevron
               Linden Everted Rim, Searles Variety

          Surface finish
               a) Smoothed to polished
          Decoration
               a) Exterior rim - incised (usually)
                              a) Parallel horizontals
                              b) Chevrons with horizontals
               b) Lip - plain, incised, cord impressed
                              a) Diagonals
                              b) Crosshatching
               c) Shoulder plain, broad and narrow trailing, incised
                              a) Lineate chevron
                              b) Lineate meander with horizontals
          Linden Everted Rim, Cottonwood Variety

IV. Everted Rims, Mankato Incised
          Surface Finish
               a) Smoothed (usually)
          Decoration
               a) Interior Rim - incised (usually)
                              a) Diagonal lines
               b) Lip Margin - finger or tool impressions
               c) Shoulder - incised, narrow trailed
                              a) Decoration only extends halfway down shoulder
                                        a) Lineate horizontal
                                        b) Triangle punctate
          Mankato Incised, Mankato Variety

          Surface Finish
               a) Smoothed (usually)
          Decoration
               a) Interior rim - incised (usually)
                              a) Diagonal lines
               b) Lip margin - incised (usually)
                              a) Fingernail
                              b) Tool
               c) Exterior rim - incised or narrow trailed
                              a) Diagonal lines - left to right and vice versa
               d) Shoulder
                              a) Lineate horizontal
                              b) Lineate meander
                              c) Triangle punctate
          Mankato Incised, Butternut Variety

M. Scullin 1976 , (amended by Kirsten Bengtson 1994). With further amendation by M. Scullin in October 2000

This is obviously a work needing more work but better by far than nothing.