Sorry Mr. Bill. Ice core layers are assumed to be annual. Since no one was there to actually observe this, it is pure conjecture. Nothing more.
"And the larger periodic cyclical changes that are evidenced therein - which coincidentally agree with orbital observations and predictions...."
Obviously, these cyclical changes are assumed by projecting observations backward into unobservable, assumed time frames. This runs into the same problem that 'dark' matter and energy does. It isn't observable and, therefore, isn't scientific.
The idea of long-ages and evolution is an ancient pagan one that the church fathers (and I) argue against. IMO, arguing for the truth of ancient pagan ideas may please Ba'al, but not your Lord and Savior.
[Obviously, these cyclical changes are assumed by projecting observations backward]
And the projections just coinkidinkly line up with the observed information stored in ice cores.