主题：【求助】（已应助）求助外文文献4篇

1 [题名]Glassy Microspherules (Microtektites) from an Upper Devonian Limestone
  [作者]Kun Wang
  [来源]Science
  [卷期页码]256,1547-1550
  [年]1992
  [DOI]10.1126/science.256.5063.1547

2 [题名] Iridium Anomaly in the Upper Devonian of the Canning Basin, Western Australia
  [作者]PHILLIP E. PLAYFORD, DIGBY J. MCLAREN, CHARLES J. ORTH, JAMES S. GILMORE, and WAYNE D. GOODFELLOW
  [来源]science
  [卷期页码]226: 437-439
  [年]1984
  [DOI]10.1126/science.226.4673.437

3 [题名] Microtektites and Mass Extinctions: Evidence for a Late Devonian Asteroid Impact
  [作者]Philippe Claeys, Jean-Georges Casier, and Stanley V. Margolis
  [来源]Science
  [卷期页码]257,1102-1104
  [年]1992
  [DOI]10.1126/science.257.5073.1102

4 [题名] Biodiversity of benthic microbial communities in bioturbated coastal sediments is controlled by geochemical microniches
  [作者]Victoria J Bertics, Wiebke Ziebis
  [来源]The ISME Journal
  [卷期页码]
  [年]
  [DOI]10.1038/ismej.2009.62