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Showing results for tags 'calcium phosphate'.
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The Amateur Paleontologist posted a topic in Fossil PreparationHey everyone, hope you're all doing well! From what I've read, small shark/fish teeth can be occasionally encountered by dissolving samples of chalk/limestone in acid. I read Jeppsson et al's 1999 paper on using buffered acetic acid to extract phosphatic fossils (in my case shark teeth), but the method outlined is not that simple and requires access to certain laboratory equipment I don't really have access to right at the moment... All I have is some cheap white vinegar, and some trays and tins I've got some samples of chalk from the Late Cretaceous of Møns Klint, a fossil site in Denmark with relatively diverse fish and shark fauna. Here's the thing - would it be OK to put the samples of chalk in white vinegar (acetic acid)? If it is, I've just got some questions -- Should I dilute the vinegar? And if so, by how much? How long should I leave the chalk in the vinegar? Any suggestions and ideas would be much appreciated, I'd love to find some little fish and shark teeth. Christian
Oxytropidoceras posted a topic in Fossil NewsSingle-celled eukaryote fossil with evidence of mineralizing found in Yukon by Bob Yirka, June 29, 2017 https://phys.org/news/2017-06-single-celled-eukaryote-fossil-evidence-mineralizing.html Precursor of teeth and bones discovered in 810-million-year old fossils. Single-celled fossils found in Canada show the earliest evidence of a tissue-hardening process known as biomineralisation, writes Andrew Masterson, Cosmos. https://cosmosmagazine.com/palaeontology/precursor-of-teeth-and-bones-discovered-in-810-million-year-old-fossils The paper is: Cohen, P. A., J. V. Strauss, A. D. Rooney, M. Sharma, and N. Tosca, 2017, Controlled hydroxyapatite biomineralization in an ~810 million-year-old unicellular eukaryote. Science Advances. Vol. 3, no. 6, e1700095. DOI: 10.1126/sciadv.1700095 http://advances.sciencemag.org/content/3/6/e1700095.full Yours, Paul H.