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Abstract
Calcite-mineralized wood occurs in marine sedimentary rocks on Vancouver Island, British Columbia at sites that range in age from Early Cretaceous to Paleocene. These fossil woods commonly have excellent anatomical preservation that resulted from a permineralization process where calcite infiltrated buried wood under relatively gentle geochemical conditions. Wood specimens typically occur in calcareous concretions in feldspathic clastic sediment. Other concretions in the same outcrops that contain abundant mollusk and crustacea fossils are evidence that plant remains were fluvially transported into a marine basin. Fossiliferous concretions commonly show zoning, comprising an inner region of progressive precipitation where calcite cement developed as a concentric halo around the organic nucleus. An outer zone was produced by pervasive cementation, which was produced when calcite was simultaneously precipitated in pore spaces over the entire zone.
Highlights
Fossil wood occurs at many sites on Vancouver Island, (Figure 1), but these fossils have received scant attention from scientists
Results peels As made from specimen surfaces that haveatbeen etched with mentioned, fossil wood specimens all localities are mineralized calcite, acetate peels have been widely used by paleobotanists
These marine fossil woods areenvironments of particular scientific interest they are mineralized with calcite
Summary
Fossil wood occurs at many sites on Vancouver Island, (Figure 1), but these fossils have received scant attention from scientists. Paleobotany work described leaf compression fossils preserved in shales and siltstones of the Nanaimo Group (Bell, 1957). Researchers have focused on permineralized plant remains, e.g., flowers, fruits, seeds, and cones. Much of this work has been done by paleobotanists R.A. Stockey and G.W. Stockey and G.W Rothwell and their students and colleagues e.g., [1,2,3]. The plethora of fossil plant organ studies is in sharp contrast to the paucity of work on mineralized woods. Taxonomic descriptions are limited to the angiosperm Paraphyllanthoxylon vancouverensis preserved as a 38 cm diameter log at the Eden Main locality [4] and the gymnosperm Cunninghamia hornbeyensis from Hornby Island [5]. Fossil palm logs have been reported from Hornby
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