Carbonate sediments can be
subdivided into two end-member realms, heterozoan and photozoan, that in many
cases relate to “cool water” and “warm water” conditions respectively. Between these end members are “subtropical”
carbonates that can include a mix of both realms. In this paper, Bensing et al. describe Lower
Permian strata from Arctic Canada that include a temporally changing,
sedimentologically mixed assemblage.
The sediments suggest a gradual cooling and decrease in seawater
temperature, but that changes in sea level and oceanographic conditions
complicated trends. The results
represented a refinement of criteria for recognizing and interpreting heterozoan
carbonates in Paleozoic strata.
Carbonate Deposition During a Time of Mid-Latitude Ocean Cooling: Early Permian Subtropical Sedimentation in the Sverdrup Basin, Arctic Canada by Joel P. Bensing,
Noel P. James, and Benoit Beauchamp
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