The Early Cambrian Burgess Shale−type fossil Lagerstätten of Yunnan Province (Chengjiang; Guanshan) are crucial in
understanding the Cambrian bioradiation. Brachiopods are applied here as a critical model phylum to analyze the
taphonomy of Yunnan fossil Lagerstätten, because shell and tissue composition of modern brachiopods can be compared
with exceptionally preserved Cambrian remains. Systematic elemental mapping and energy−dispersive X−ray analyses
have been carried out to study fossil brachiopods and their matrix from Cambrian Stages 3–4 and modern linguliform
brachiopods from several geographical regions in order to evaluate the detailed structure of the shells and the biological
and environmental influences on shell composition. Analyses of earliest Cambrian fossils encompassing the complete
spectrum of weathering stages show a primary organo−phosphatic brachiopod shell, visible in unweathered specimens,
and a successive dissolution and replacement of the shell during weathering, observable in specimens that underwent dif−
ferent stages of weathering. Therefore, our study reveals that earliest Cambrian linguliform brachiopods from the
Chengjiang and Guanshan Biotas developed organo−phosphatic shells as their Recent counterparts. Early carbon and apa−
tite preservation together with rapid deposition in claystone, instead of early iron adsorption, appears crucial for the pres−
ervation of highly delicate tissue. Primary calcium, phosphorus, organic carbon, and a multilayered shell are present, by
inference between Cambrian fossils and Recent specimens, through the whole Phanerozoic. Elements such as silicon, sul−
phur, calcium, phosphorus, and iron were detected, impregnated with organic compounds in some organs of modern
Lingula, and related to the potential of fossilization of Cambrian linguliform brachiopods. Ferromanganese precipitates
traced in the shell of in vivo specimens of modern Lingula may enhance the potential for fossilization too.
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