Not really what you're looking for, and others have provided answers for you, but I found this article by Glen Morton replying to an AiG article on the Green River Formations. In this formation two volcanic layers have been identified and dated to 4.65 and 4.94my (based on K/Ar, Ar/Ar and fission track dating), with the distance between these layers being 150 feet. This gives a yearly deposition of 0.0157mm which is consistent with other findings. This could be compared to the deposition rate of Lake Suigetsu and its deposition rate and consistency with radiocarbon dating.
Also noted in the article was that there was a difference in the number of laminations between the edges of the lake (1566 layers) and the centre of the lake (1089 layers). The extra layers at the edges of the lake were the result of runoff from storms which did not reach the centre of the lake. This fact would seem to answer one of Mindspawns objections to the lake Suigetsu varves of sensitivity to significant rainfall.