Fig. 5

Microfabrics of Thalassinoides in the Zhushadong Formation of the Guankou section. a–b The boundary between filling and host rock is sharp, the filling consists of euhedral and semi-euhedral crystalline dolomites, whereas the host rock is dominated by microcrystalline calcite; c–f After alizarin red staining, the white part of burrow filling consists of semi-euhedral dolomites, and the red part of host rock is dominated by microcrystalline calcites. The boundary between filling and host rock is sharp, and, particles in the host rock are clearly smaller than those in the filling