2004•GeobiosRequires access
Potential Global Standard Stratotype-section and Point (GSSP) for a Cambrian stage boundary defined by the first appearance of the trilobite Ptychagnostus atavus, Drum Mountains, Utah, USA
Loren Edward Babcock, Margaret N. Rees, Richard A. Robison, Elizabeth S Langenburg, Shanchi Peng
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Abstract
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