Well, before moving forward, just figured I would share
Palisades sill: A Jurassic intrusion? Evidence from 40Ar/39Ar incremental release ages | Geology | GeoScienceWorld
Its tricky trying to copy and paste but
"Available K-Ar dates from the Palisades sill (142 to 202 m.y.) are generally younger than the ages of post-Triassic intrusive rocks in other areas. 40Ar/39Ar release spectra of chill-zone samples record ages of 192 and 186 m.y. and furnish no evidence of postcrystallization argon loss. These ages are similar to published K-Ar biotite ages (186 to 196 m.y.) and probably refer to the time of crystallization of the sill. As recent paly-nologic studies in the Hartford basin have shown that rocks stratigraphically equivalent to those intruded by the Palisades are, in part, of Early Jurassic age, the 40Ar/39Ar ages are not inconsistent with absolute age brackets on the Triassic Period."
Heres another example of correlating methods.
While the specific shale beds being referred to arent dated, layers above and below are, with correlating results from independent labs using varying methods.
DISCUSSION
A ~ 190-m.y. Jurassic age for the
Palisades sill is consistent with recent
concepts of the tectonic evolution of
the continental margin of eastern North
America. The intrusive and volcanic
rocks of the Triassic grabens are gen-
erally considered to be an expression of
the onset of rifting in the North Atlantic
basin (see summary in Noltimier, 1974).
As extrapolation of sea-floor spreading
rates in the North Atlantic suggests that
the eastern North American continental
margin is between 190 and 200 m.y. old
(Peterson and others, 1970; Emery and
others, 1970; Phillips and Forsyth, 1972),
a ~ 190-m.y. crystallization age for the
Palisades sill is in harmony with this
model as its intrusion should have im-
mediately preceded the beginning of
active lateral spreading in the early
North Atlantic basin (between 190 and
200 m.y. ago)
Basically what they are saying is that, not only do their dating methods and results correlate with the results of alternate dating methods and results of other independent labs, but their results also correlate, or make sense in light of uniformitarian tectonic motion. Theyre correlating the age of the New York Palisades with the splitting of Pangea. Which is further in line with visual observation of the rates by which continents move, as observed today.