The geologic records of δ 18 O in carbonate, chert, phosphorite, glauconite, and shale (fig. S1) display a secular increase of 10 to 20 per mil (‰) since the Archean (1–7).The trend is considered by most [see (2, 8) for opposing views] to be a primary signal, because it is global and independent of metamorphic grade, mineralogy, and paleoenvironment ().
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A low-density clay ceramic syntactic foam (CSF) composite material was successfully synthesized from illitic clay added by fly ash cenospheres (CS) using the semi-dry formation method. The content of CS varied in the range of 10, 30, 50 and 60 vol %.
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9/2/2011· This paper was originally published in the Proceedings of the Fifth International Conference on Creationism, pp. 127–142 (2003) and is reproduced here with the permission of the Creation Science Fellowship of Pittsburgh ( org). Introduction Giem1 reviewed the literature and tabulated about 70 reported AMS measurements of 14 C in organic materials from the geologic record
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Silicon carbide abrasive paper of successive grits 600 and 800 – (3M Espe, Monrovia, USA) was used on a polishing machine (Arotec, São Paulo, Brazil) to remove excess resin, thus exposing the …
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