Over the last 60 years, there have been
numerous attempts to formalize Sequence Stratigraphic Methodogies within
the Stratigraphic Code
Formats (Forgotson, 1957)
Sequences (Wheeler, 1958 & 1959)
Chronosomes (Shultz, 1982)
Synthem (Salvador, 1987)
Allostratigrahy (NACSN, 1993)
Sequences (Salvador, 2000)