@article{oai:shizuoka.repo.nii.ac.jp:00000393,
 author = {Sutherland, J. Isabel},
 journal = {Geoscience reports of Shizuoka University},
 month = {Mar},
 note = {application/pdf, Silicified woods of probable Altonian (Lower Miocene) age occur in southeast Hukatere Peninsula, Kaipara Harbour, New Zealand. Pyroclastic flows, apparently flow-ing from a northerly direction, carried woods from a broadleaf-podocarp forest to mix with probable Avicennia ( mangrove) growing in estuarine conditions close to the site of preservation. Many woods were partially or completely carbonized by the flow. Thin section petrography, scanning electron microscope micrographs, and X-ray diffractograms indicate the woods were silicified by silica in solution, formed by devitrification of volcanic glass. The sequence of silicification is likely to have been either opal-A → opal-CT → a -quartz and chalcedony, or directly to a -quartz and chalcedony. The degree of crystallinity of the quartz is not time dependent. The mode of occurrence of a -quartz, chalcedony, cristobalite, tridymite, Iussatite and amorphous opal is described. Other minerals present in the woods include goethite and members of the saponite group, as well as organic compounds.},
 pages = {143--151},
 title = {Some aspects of petrification of Miocene wood from Kaipara Harbour, New Zealand(MEMORIAL VOLUME TO THE LATE PROFESSOR TERUHIKO SAMESHIMA)},
 volume = {20},
 year = {1994}
}