"A: The xenoconformity at the contact between the glaciogenic Elatina Formation below and the Nuccaleena cap dolostone in Brachina Gorge (Flinders Ranges, South Australia) was chosen as the Global Stratotype Section and Point (i.e., GSSP or ""golden spike"") for the ca. 635 Ma base of the Ediacaran Period (Knoll et al., 2006). B: This same surface can be identified with confidence globally, including in Svalbard, where it marks the contact (white arrow) between the Cryogenian Wilsonbreen Formation and the Ediacaran Dracoisen cap dolostone."
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