Areas: Sedimentary structures, sedimentation and biostratigraphy of Neoproterozoic and lower Phanerozoic deposits, Newfoundland, Colorado Rockies and Great Basin., bedforms and stratification Doctor ...

Biostratigraphy from ref. 14 and references therein. Negative excursion begins at level a, shows a large abrupt decrease in δ 13 C values at level b, and terminates at level c.