Cambrian burgess shale animals replicated in clay minerals
Although the evolutionary importance of the Burgess Shale is universally acknowledged, there is disagreement on the mode of preservation of the fossils after burial. Elemental mapping demonstrates that the relative abundance of elements varies between different anatomical features of the specimens. These differences reflect the compositions of the minerals that replicated the decaying organism, which were controlled by contrasts in tissue chemistry. Delicate morphological details are replicated in the elemental maps, showing that authigenic mineralization was fundamental to preserving these fossils, even though some organic remains are also present.
Department of Earth Sciences, University of Bristol, Queen's Road, Bristol BS8 1RJ, UK.
PJ
Orr
DEG
Briggs
SL
Kearns