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Estimating the Rock Volume Bias in Paleobiodiversity Studies
James S. Crampton,1*Alan G. Beu,1Roger A. Cooper,1Craig M. Jones,1Bruce Marshall,2Phillip A. Maxwell3
To interpret changes in biodiversity through geological time,it is necessary first to correct for biases in sampling effortrelated to variations in the exposure of rocks and recoveryof fossils with age. Data from New Zealand indicate that outcroparea is likely to be a reliable proxy of rock volume in bothstable cratonic regions, where the paleobiodiversity recordis strongly correlated with relative sea level, and on tectonicallyactive margins. In contrast, another potential proxy, the numberof rock formations, is a poor predictor of outcrop area or samplingeffort in the New Zealand case.
1 Institute of Geological and Nuclear Sciences, Post Office Box 30-368, Lower Hutt, New Zealand. 2 Museum of New Zealand Te Papa Tongarewa, Post Office Box 467, Wellington, New Zealand. 3 Bathgates Road, R.D. 10, Waimate, South Canterbury, New Zealand.
* To whom correspondence should be addressed. E-mail: j.crampton{at}gns.cri.nz
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