Extended Data Figure 7: Cartoon explaining preservation of YPM 227515, cross-sectional view.
From: Ancestral morphology of crown-group molluscs revealed by a new Ordovician stem aculiferan
a, Prior to burial. b, Burial. c, Decay and replacement of the mantle and sclerites by pyrite. d, Compaction. e, Weathering and uneven splitting along the dorsal mantle, cross cutting sclerites and along smooth, ventral mantle.
