Abstract
Comparison of secular variations in carbon-isotopic compositions of carbonates from the NeoproterozoicCambrian succession in the Whiteinyo region of eastern California with similarly-aged sequences worldwide suggests that, in California, a hiatus potentially encompassing the latest Neoproterozoic and much of the Tommotian may be present. The hiatus is found between the carbonate units in the Lower Deep Spring Formation, suggesting that the lowermost Deep Spring, Reed, and Wyman formations are Neoproterozoic in age, and the remaining Deep Spring Formation is uppermost Tommotian or Atdabanian in age. It is unclear where the Neoproterozoic-Cambrian boundary may lie, since chemostratigraphic data is not available for the boundary in New foundland type section, but it is most-likely encompassed within the inferred hiatus
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