You may find useful these papers :
Galvez et al., 2012, Morphological preservation of carbonaceous plant fossils in blueschist metamorphic rocks from New Zealand, Geobiology, 10, 118 - 129.
Bernand et al., 2010, Multiscale characterization of pyritized plant tissues in blueschist facies metamorphic rocks, Geochmica et Cosmochimica Acta, 74, 5054-5068
Bernard et al., 2007, Exceptional preservation of fossil plant spores in high-pressure metamorphic rocks, Earth and Planetary Science Letters, 262, 257 - 272
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