Abstract
Cretaceous silicoflagellate assemblages from Arctic Ocean USGS Core 437 showVallacerta siderea the most abundant species; most species ofLyramula disappear halfway up the core; onlyL. burchardae, n. sp., persists into the upper sections. These occurrences are untypical of the few documented Cretaceous assemblages from other areas. A Campanian or Maestrichtian age is suggested by correlation, but the uniquely high abundance ofV. siderea and lack ofCorbisema suggests that a difference in both age and general environment could be involved. If Core 437 is latest Maestrichtian, then the evidence from this core would constrain the timing of the ocean-freshening model for the Cretaceous-Tertiary boundary extinctions.
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Bukry, D. Cretaceous Arctic silicoflagellates. Geo-Marine Letters 1, 57–63 (1981). https://doi.org/10.1007/BF02463303
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DOI: https://doi.org/10.1007/BF02463303