Like dating fossils by rock strata and then dating other rock strata a half mile over by the fossils they contain?
Thats circular reasoning and is never done. Thats a Creationist bullshit statement made to their minions of ignorantii.
Correlation is the demonstration of correspondence in character and stratigraphic position between GEOGRAPHICALLY SEPARATED bodies of sedimentary rocks.(ISSC 1994). Correlation always is achieved by two or moe independent means of cross verification to determine correspondence in age and chronostratigraphic position (ISG 1976).
Ive heard Duane Gish once state that same mantra that gunga stated and he had his **** handed to him by some student merely quoting the same rules of the science. Duane was a physicist and was totally ignorant of the rules of what he was attempting to discredit.
PEople who do these things for a living (academic and applied science geos) arent that stupid as to date the fossils by the stratigraphy and then circularly date an adjacent stratigraphy by the fossils . The fossils and the stratigraphy would have to have been established by one of about 15 separate chrono determination means before any "circularity shortcut " is attempted.
The YEC and OEC arguments against geo science (such as that one offered by gunga) are relatively few and all are quite lame.