juvenissun
... and God saw that it was good.
- Apr 5, 2007
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How would collapsing glacial fronts manage to sort annual pollen variation into the right layers? How do daily and weekly varves end up with volcanic ash layers that match historic eruptions when read as annual varves? Why do varves match the Carbon 14 dating close enough to calibrate it and fit the Carbon 14 calibration from tree rings?
Good questions. I don't know the answer.
However, the evidences you quoted are sufficient conditions, but are not necessary conditions. I don't think all glacial varves match those criteria (or show those features). Even one glacial varve deposit may show different chronology at different locality. Irregular time interval would become more common when the size of sediments in each varve layer varied significantly, i.e. shows an obvious graded bed rather than just a color change.
Sorry, I don't mean to treat you as a geologist. You are good in geology anyway. I am trying to argue that geology is too complicated to specify any particular idea based on one or two pieces of evidence.
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