SUPPLEMENTAL FIGURE CAPTIONS SUPPLEMENTAL DATA 1—Columnar section of the Treptichnus pedum Zone of the Chapel Island Formation in Fortune Head, Newfoundland. Stratigraphic height measurements are shown in meters. Grain sizes are shown by the horizontal widths. The color bars show the color of rocks (green=greenish gray; red=reddish gray). The PC–C boundary at 15 m was defined by Brasier et al. (1994). The gutter cast facies (GC facies) corresponds to the interval of 14–32 m, the siltstone dominated facies (SiS-D facies) to 36–108 m, and the shoreline facies (Sh facies) to 108– 154m. SUPPLEMENTAL DATA 2—Columnar section of the Rusophycus avalonensis Zone of the Chapel Island Formation in Fortune Head, Newfoundland. The stratigraphic heights, grain sizes and the color of the beds are shown as in the Supplementary Data 1. The whole section is included in the sandstone dominated facies (SS-D facies). SUPPLEMENTAL DATA 3—Columnar section of the uppermost Dengying and Zhujiaqing formations in Meishucun, Yunnan. Scale bar=5 m. The horizontal widths show relief of the outcrop against weathering, not grain sizes. SUPPLEMENTAL DATA 4—Columnar section of the Tsagaan Oloom and Bayan Gol formations 1 in Bayan Gol gorge, Gobi-Altai. Stratigraphic height measurements are shown in meters. The horizontal widths show relief of the outcrop against weathering, not grain sizes. The red line at 323 m corresponds to the boundary between the Tsagaan Oloom and the Bayan Gol formations, namely the PC–C boundary in this study. The stratigraphic heights between 323–334 m shows poor exposure. The unit 18 corresponds to 323–393 m, the unit 19 to 393–452 m, and the unit 20 to 452 m. 2