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ISSN 0883-1351
EISSN 1938-5323
In this Issue
  • Cover Image

    Cover Image

    issue cover

    COVER EXPLANATION.—Top: Outcrop of the Battle Formation overlying the Whitemud Formation at Horseshoe Canyon, Alberta, Canada. Bottom: The oldest known specimen of the freshwater diatom, Aulacoseira, from the Battle Formation.

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