Ma and 180 Ma. Nevertheless, these observations raise several clear issues that require discussion. A. The pre-Flood/Flood boundary Austin and Wise (1994) and Whitmore and Garner (2008) established some definitive guidelines for recognizing the pre-Flood/Flood boundary in the geologic record. They then applied those guidelines in two areas, the Mohave–Grand Canyon region and Wyoming, respectively, to conclude that the pre-Flood/Flood boundary approximated to the Cambrian/Precambrian in the rock record. This corresponds in North America to the Great Unconformity, which has been recognized as essentially a global, massive erosional event horizon (Peters and Gaines 2012) that would thus correlate with the onset of the Flood. The radiohalos frequency data tabulated in this study and plotted in Fig. 5 appear to be consistent with Cambrian/Precambrian boundary in the rock record being approximately the pre-Flood/Flood boundary. Admittedly, this determination based on radiohalos frequency is not definitive, as there is an already-noted paucity of data between 500 Ma and 600 Ma. Furthermore, if that gap in data were filled it might thus incorporate the tiny 600-700 Ma peak into the 200500 Ma peak, and then it might be argued that the pre-Flood/Flood boundary could be earlier in the geologic record than the Cambrian/ Precambrian boundary. However, it is the 200-500 Ma peak dominated by numerous granites with extraordinarily high radiohalos frequency per slide which would clearly correlate with the Flood. Namely, granites that formed during the Flood expelled water as they crystallized and cooled that facilitated the generation of many radiohalos. In contrast, if the Precambrian granites are pre-Flood, then when the Flood came they were already crystallized and cooled. Thus, during the Flood they were only heated again by the pulse of accelerated radioactive decay of whatever 238U was still in them, and there was not the same amount of water available in those already-crystallized granites to generate many radiohalos to replace those annealed by the pulse of accompanying heat. 0 0 100 200 300 400 500 600 700 800 900 1000 1500 2000 2500 3000 5 10 15 20 25 30 35 40 45 50 55 60 65 Number of Radiohalos per Slide Millions of Years Ago (Ma) Granites Metamorphic rocks Figure 5. Plot of the number of radiohalos per slide (y-axis) for each rock unit in Tables 1 and 2 versus the conventional age in millions of years (x-axis) from 0-3500 Ma. The granites are marked with dots and the metamorphic rock units with red crosses. SNELLING Radiohalos through earth history 2023 ICC 553
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