The Earth's atmosphere contains various isotopes of carbon, roughly in constant proportions.
These include the main stable isotope (12C) and an unstable isotope (14C).
Carbon-14 comes from nitrogen and is independent of the carbon-12 reservoir.
If even a small percentage of the limestone deposits were still in the form of living marine organisms at the time of the Flood, then the small amount of carbon-14 would have mixed with a much larger carbon-12 reservoir, thus resulting in a drastically reduced ratio.
Contributing Studies: Szmidt, CC, Normand C, Burr GS, Hodgins GWL, La Motta S (2010) AMS 14C dating the Protoaurignacian/Early Aurignacian of Isturitz, France., “Implications for Neanderthal-modern human interactions and the timing of technical and cultural innovations in Europe”, .
Project Description: Five parchment Portolan (early nautical) Charts from the Mediterranean were selected by the curators of the Geography and Maps Division, Library of Congress for radiocarbon dating.
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The five charts spanned the time period 1320 through 1633 to aid investigations into whether the charts were from the specified time periods, or were created by a cottage industry known to occur many centuries later.
An important aspect of the study was a series of controlled tests comparing the radiocarbon content of un-cleaned, possibly contaminated samples, with chemically cleaned equivalents.
We could put forward the following counter arguments to the constancy of these assumptions: a) The constancy of cosmic ray bombardment might be questioned.