By L. Sprague De Camp
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Extra resources for A Gun for Dinosaur
This decrease indicates the limit of the pedogenic front for that particular package. A new package is defined at that point where the OCR ratio begins its pattern of successive increases. The lower OCR ratio value reflects the inherited value of the non-pedogenic depositional sediment. In some cases, for example field-designated Ab3 and Ab4, there is no drop in the OCR ratio value between soil packages. The Ab3 differs visually and texturally from the Ab4, and therefore the two still represent independent event packages.
Both iron and phosphorous are essential nutrients critical for biotic life in the soil . Sulfur, conversely, is water soluble in its oxidized form. With the advent of an atmosphere containing free oxygen, sulfur would have been quickly lost from the soil through leaching. In humid climates sulfur is present in soil primarily in combination with biologically generated compounds and becomes available to other plants only during the biodegradation of organic matter. The strategy of phytocycling sulfur by plants makes sense from the plant’s point of view, but it also proves beneficial to the soil itself.
I expected based on the available literature that the results would be similar, with the Walkley-Black procedure recording 75% to 80% of that recorded by the Ball Loss on Ignition procedure. Instead they varied by as much as one order of magnitude. Â€The noted deviation in my results appeared to correlate with the 14C age of the samples. The older 14C dates correlated with larger discrepancies between the two organic carbon procedures. A linear correlation between only three points is not significant, so I obtained additional samples from other archaeological sites.
A Gun for Dinosaur by L. Sprague De Camp