37d6e8c88a Article Servais, T., Stricanne, L., Montenari, M. The theoretical advances and greatly improved data available by the 1970s enabled a "grand synthesis" to be made, best known from the 1976 paper Variations in the earths orbit: pacemaker of the ice ages (in Science), by J.D. A. Any newly formed fluor silicates were removed using a second 17% HCl treatment, over 32 h and at 60 C. (a) Teratological specimen of Ancyrochitina (sample 2,127.5 m). The Pridoli event that is studied here mainly affected corals, chitinozoans, graptolites and conodonts. Geochemistry of recent oxic and anoxic marine sediments: implications for the geological record. Download PDFs Help Help .
Analyses were performed semi-quantitatively using two settings: ‘mapping mode’ (500 500-m2 grids, and the acquired images were 512 512 pixels, which has the advantage of simultaneously analysing multiple specimens) and ‘focused beam mode’ (focussing the Bi-pulsed beam on a 5 5-m2 grid and in doing so removing surface layers from specimens). & Pross, J. Palaeontology 47, 395–414 (2004). Rev. Maslin , James A. Chitinozoans are organic-walled microfossils (palynomorphs), 100–500 m long, which probably represent fossil egg cases of marine zooplankton that lived in the shallow mixed layer of the Ordovician–Silurian oceans27. Data on 19 elements of 141 ToF-SIMS spectra (spread over 13 stratigraphical levels) were pre-scaled using auto-scaling47 (spectral variables are scaled to a zero mean and unit variance) as some of the spectral peaks of interest are relatively small.
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