Fig. 2. Fossil locality and depositional environment. A in The Early Cambrian origin of thylacocephalan arthropods

Fig. 2. Fossil locality and depositional environment. A. Simplified paleogeographic map of the Yangtze Platform during the Sinian–Cambrian boundary showing main facies distribution (asterisk for fossil locality). B. Alternating siltstones−mudstones layers at Shankoucun (Maotianshan Shale, Lower Cambrian). Map after Zhu et al. (2003; simplified). bg, background mudstone; se, single−event mudstone (see explanation in text).