Journal metrics

Journal metrics

  • IF value: indexed IF
    indexed
  • IF 5-year value: indexed IF 5-year indexed
  • CiteScore value: 0.79 CiteScore 0.79
  • SNIP value: 0.533 SNIP 0.533
  • SJR value: 0.255 SJR 0.255
  • IPP value: 1.70 IPP 1.70
  • h5-index value: 8 h5-index 8
  • Scimago H index value: 23 Scimago H index 23
J. Micropalaeontol., 33, 193-203, 2014
https://doi.org/10.1144/jmpaleo2013-020
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 4.0 License.
 
01 Sep 2014
Development of the freeze–thaw processing technique for disaggregation of indurated mudrocks and enhanced recovery of calcareous microfossils
Alice E. Kennedy and Angela L. Coe Department of Environment, Earth and Ecosystems, Centre for Earth, Planetary, Space and Astronomical Research, The Open University, Walton Hall, Milton Keynes, Buckinghamshire MK7 6AA, UK
Keywords: foraminifera, hydrogen peroxide, freeze–thaw, mudrocks, microfossil extraction Abstract. Microfossil extraction from indurated mudrocks is widely acknowledged as challenging, especially for foraminifera. Here we report development of the freeze–thaw extraction method through the addition of rapid heating, detergent and ultrasound stages. We use indurated mudrock samples from the Toarcian (Early Jurassic) of Yorkshire, UK to assess the effectiveness and develop the freeze–thaw method. We compare our results from freeze–thaw with those from standard foraminifera processing techniques, including the use of hydrogen peroxide. Processing by freeze–thaw increased the degree of mudrock disaggregation and resulted in no damage or dissolution of foraminifera. Following the freeze–thaw method with treatment in white spirit and sodium hexametaphosphate aided the separation of foraminifera from the disaggregated clays and was twice as efficient as pressure washing. Samples processed with hydrogen peroxide contained damaged microfossils and an under representation of delicate calcareous foraminifera. Many other studies of indurated mudrocks have used hydrogen peroxide to extract foraminifera, and this might have resulted in apparently barren intervals. The freeze–thaw method outlined here provides a low-cost, low-risk and successful method of disaggregating and extracting calcareous microfossils from indurated mudrocks. We anticipate our method may be relevant for other fossil groups and merits further development.

Citation: Kennedy, A. E. and Coe, A. L.: Development of the freeze–thaw processing technique for disaggregation of indurated mudrocks and enhanced recovery of calcareous microfossils, J. Micropalaeontol., 33, 193-203, https://doi.org/10.1144/jmpaleo2013-020, 2014.
Publications Copernicus
Download
Share