Fig. 7: Stratigraphic context of the fossil material described here.
From: A potential cephalopod from the early Cambrian of eastern Newfoundland, Canada
Note that the level of occurrence (marked by star) precedes the first occurrence of euarthropods (c. 521 Ma) and Graptoloids, as well as the hitherto known first occurrence of cephalopods (Plectronoceratidae). Abbreviations: Fm Formation, SSFs Small Shelly Fossils. Family range chart from Fang et al.8. Stratigraphy from Hutchinson11, Landing et al.15, King18, and McCartney83. Geochronology: 530.7 ± 0.9 Ma87 recalculated as c. 528 Ma25,88; 543.9 ± 0.2 Ma, 519.0 ± 1.0 Ma, 511.0 ± 1.0 Ma, 570.94 ± 0.38 Ma, 566.25 ± 0.35 Ma89. Composite carbon isotope excursions compiled from Brasier et al.83 (SHICE, CARE) and Peng et al.90 (BACE, ZHUCE, MICE, AECE, ROECE, DICE).
