Age of mankind, dating, and the flood

"The radiocarbon in the leaf fossils preserved in the sediment of Lake Suigetsu comes directly from the atmosphere and, as such, is not affected by the processes that can slightly change the radiocarbon levels found in marine sediments or cave formations."
http://www.sciencedaily.com/...ases/2012/10/121018141834.htmAs others have mentioned, they dated terrestrial organic material such as leaves, twigs, and even insects. They didn't carbon date the diatoms. What they used the diatoms for was measuring annual deposits. Each spring and summer there is a bloom of diatoms which produces a white deposit. In the fall/winter there is less diatom growth so the deposits are dominated by darker colored clays. Therefore, a white diatom layer and a darker clay layer makes one year. This is what it looks like: So what they did was compare the carbon date of the terrestrial organic material to the layer defined by the counting of diatom layers.

What makes you so sure that tides would bring salt water into the lake and produce layers that exactly mimic annual varving in freshwater lakes? Moreover, how could such a process sort leaf and insect debris so that it exactly mimics the fluctuations in the 14C dendrochronology data and the ice layer data?Edited by Taq, : No reason given.