Really? Let's see some peer reviewed papers on that. I can show you example after example of layers that could not have formed quickly. The only evidence is of slow growths. Let's take varves for instance. Do you know what varves are?
Yes, and they can be laid down very quickly.
Such long time estimates are believable to those holding to the gradualism paradigm and assumed to be based on present processes.
What we actually see happening defies the gradualism theory. Sediment rapidly flooding into lakes; underwater slides; turbidity currents; snow-melt events; underflows from a muddy bottom layer; overflows from a muddy layer floating at the top of a lake; interflows from a muddy layer at intermediate depths; and multiple rapid blooms of microorganisms within one year.
"It is very unfortunate from a sedimentological viewpoint that engineers describe any rhythmically laminated fine-grained sediment as “varved.” There is increasing recognition that many sequences previously described as varves are multiple turbidite sequences of graded silt to clay units ... without any obvious seasonal control on sedimentation.
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(Quigley, R. M, Glaciolacustrine and glaciomarine clay deposition: a North American perspective; in: Eyles, N., editor,
Glacial geology—an introduction for engineers and earth scientists, Pergamon Press, New York, p. 151, 1983.)