Item talk:Q41289

Mindat Description

A fine-grained pelagic sediment consisting dominantly of calcareous or siliceous organic remains

Geoscience Ontology Description

Biogenic sediment consisting of less than 1 percent gravel-size (greater than or equal to 2 mm) particles, with a sand to mud ratio less than 1 to 9, and less than 50 percent carbonate minerals. Neuendorf et al. 2005 put cutoff at 30 percent skeletal remains; this is raised to 50 percent in This vocabulary for consistency with definition of other Biogenic sediment category