>Are these cycles the fortnight cycles? If so, there is no problem. Leaves
>today last quite a long time in lakes and streams prior to their
destruction.
These very delicate lace-like leaves would have to have stood vertically in
the water column, unsupported, with no evidence of decay, while daily tidal
currents swept repeatedly across them, for two months (at least). Not a
chance. There is a problem with that interpretation. But maybe it would
be easier to explain away the leaves than to attempt to reinvestigate the
data on the cycles.
Art
http://biology.swau.edu