Extended Data Fig. 7: Fossil preservation of the Huayuan biota revealed by scanning electron microscopic energy dispersive spectroscopy (SEM-EDS) and X-ray microcomputed tomography (μCT).
From: A Cambrian soft-bodied biota after the first Phanerozoic mass extinction
a, Characteristic Burgess Shale-type preservation where soft tissue is preserved as carbonaceous film, which is covered by an additional coating of sparry calcite, as shown by the SEM-EDS maps of the problematic Herpetogaster collinsi, NIGP 208847. b, Iron-rich minerals capturing fossil morphology, as shown by the SEM-EDS maps and μCT maximum projection image of a possibly weathered specimen of the poriferan Crumillospongia? sp. nov., NIGP 208816. c, Original phosphatic preservation of biomineralized sclerite plates, with formation of pyrite grains on top of the sclerites, as shown by the SEM-EDS maps of the palaeoscolecid Wronascolex geyiensis, NIGP 208848. Each test of SEM-EDS mapping was performed once.
