A common doubt among our students when writting the verb CONSIST is the preposition that follows this verb. In Spanish we use : Consistir en, that's the point where the error comes from.
(Una duda muy común entre mis estudiantes de Inglés , es la preposición del verbo consistir, debido a su semejanza con el verbo Español : consistir en .)
According to he Columbia Guide to Standard American English. 1993
Consist IN means: " is inherit or lies within"
" His social success consists in being able to persuade everyone of his amiability"
Consist OF means : " is composed or made up of"
" His fleet consists of a day sailer, a canoe, and a small skiff"
Consist ON is not correct.