The specimen YPM 1981, holotype of "Brontosaurus amplus", was found at Reed's Quarry 11 at Como Bluff, not Reed's Quarry 10 as indicated in the table (see McIntosh & Berman 1975). I apologize for the typo.

The character states as written do not correspond to how they are figured in Fig. 62. The states in the figure are as they were used in the matrix: 227-0 should be "absent" and 227-1 should be "present". In any case, this does not influence the result, of course.