The fancy array stuff (which honestly isn't anything particularly special these days) was added in F90. I can assure you that there's still F77 code being actively used in the scientific community.
When I was at uni (10 years ago) I worked with libraries written in FORTRAN 4. Those that used F77 were ported only because it was necessary for use with the HP-FORTRAN compiler. The only F90 code in the department was my own.
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The fancy array stuff (which honestly isn't anything particularly special these days) was added in F90. I can assure you that there's still F77 code being actively used in the scientific community.
When I was at uni (10 years ago) I worked with libraries written in FORTRAN 4. Those that used F77 were ported only because it was necessary for use with the HP-FORTRAN compiler. The only F90 code in the department was my own.