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Found 4 results

  1. Harry Pristis

    Pathologies (knots) in Petrified Wood

    From the album: PLANT, WOOD & MINERAL SPECIMENS

    In the Early Pleistocene, about two million years ago, these twigs and bits of trunk were driftwood in the paleo Santa Fe River. The waterlogged twigs sank to the bottom in a basin in the river channel. They became buried in a highly organic mud during seasonal flooding. This anaerobic, low-energy burial preserved fine details such as bark and even insect borings. The wood is thoroughly mineralized with apatite (not "silicified" as labelled) -- it 'clanks' when two pieces are tapped together. This wood is dated biochronologically by the vertebrate fossils also found in the mud, notably Holmesina floridana, a giant armadillo. Fossils of the beavers Castor and Castoroides, muskrats, grebes, cormorants, ducks, and large fish suggest that this was a backwater pool in the river.

    © &copyHarry Pristis 2008

  2. Harry Pristis

    twig pathology

    From the album: PLANT, WOOD & MINERAL SPECIMENS

    This bit of petrified wood, largely replaced by apatite (calcium phosphate), exhibits some damage from insects, or it may be a canker from a bacterial or viral infection. You can see other images with a brief discussion here: http://www.thefossil...ogy#entry368790 In the Early Pleistocene, about two million years ago, these twigs and bits of trunk were driftwood in the paleo Santa Fe River. The waterlogged twigs sank to the bottom in a basin in the river channel. They became buried in a highly organic mud during seasonal flooding. This anaerobic, low-energy burial preserved fine details such as bark and even insect borings. The wood is thoroughly permineralized with fluorapatite -- it 'clanks' when two pieces are tapped together. The flourapatite comes from the mineral-laden spring-water of the river. This wood is dated biochronologically by the vertebrate fossils also found in the mud, notably Holmesina floridana, a giant armadillo. Fossils of the beavers Castor and Castoroides, muskrats, grebes, cormorants, ducks, and large fish suggest that this was a backwater pool in the river.

    © Harry Pristis 2013

  3. Harry Pristis

    Beetle Borings on Petrified Wood

    From the album: PLANT, WOOD & MINERAL SPECIMENS

    In the Early Pleistocene, about two million years ago, these twigs and bits of trunk were driftwood in the paleo Santa Fe River. The waterlogged twigs sank to the bottom in a basin in the river channel. They became buried in a highly organic mud during seasonal flooding. This anaerobic, low-energy burial preserved fine details such as bark and even insect borings. The wood is thoroughly mineralized with apatite -- it 'clanks' when two pieces are tapped together. This wood is dated biochronologically by the vertebrate fossils also found in the mud, notably Holmesina floridana, a giant armadillo. Fossils of the beavers Castor and Castoroides, muskrats, grebes, cormorants, ducks, and large fish suggest that this was a backwater pool in the river.

    © Harry Pristis 2008

  4. Oxytropidoceras

    "Instant" Fossilization

    Surprise! Fossils in a flash What the study of death, decay and ‘instant’ fossils is telling science about how life has evolved. Douglas Fox, Science News for Students, May 16, 2020 https://www.sciencenewsforstudents.org/article/surprise-fossils-flash Yorus, Paul H.
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