GNU Emacs Manual. Node: Fortran Indent
Fortran Motion
Fortran
Fortran Comments
20.16.2: Fortran Indentation
Special commands and features are needed for indenting Fortran code in
order to make sure various syntactic entities (line numbers, comment line
indicators and continuation line flags) appear in the columns that are
required for standard Fortran.
Fortran Motion
Fortran
Fortran Comments