Early bivalve shell sections distinguish laminar fabrics from undisputed nacre.
Represented range521–513 Ma
RegionsCambrian Series 2 localities in Siberia and Australia
CladesBivalvia · Pojetaia runnegari
Claim ledger
morphology · medium
New Pojetaia shell sections preserve a laminar inner microstructure comparable to foliated aragonite; the study does not identify undisputed Cambrian nacre and instead tests independent later origins of nacre across molluscan classes.