Fig. 3

a Emergency excavation in 2005. The thick, nodular bed in the middle corresponds to layer 17′000 which is laterally highly variable and comprises the Nanogyra oyster buildups, storm shellbeds, and intercalated marls and claystones, the latter having yielded the ophiuroid remains. b Storm shellbeds from the very top of layer 17′000. Note concave-up Nanogyra shells on top of the upper shell bed and erosional features at its base. Besides Nanogyra, the shell bed also contains abundant remains of other bivalves, serpulids and crinoids. Sample QLP005-164, sub-layer 17000I located at the top of layer 17′000, scale bar is 5 cm