Silberling, Jewell, and Nichols raise important points concerning the carbon storage capacity and age estimates of Antler foreland basin deposits in Nevada and Utah which bear on the interpretation of a large δ13C (+7‰) peak recorded in carbonates of late Kinderhookian and early Osagean age in North America and western Europe (Saltzman et al., 2000). The steady-state isotopic mass balance for a δ13C shift of ±4‰–5‰ indicates at least a 50% to 70% increase in fraction of carbon buried as organic matter (forg); if we use average Phanerozoic values for masses and...

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