By: CSULB-Geology
License: Copyright, All Rights Reserved

Uploaded: 22 Feb 2021
Last Updated: 12 Mar 2021

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Organic-rich siliceous mudstone from the Upper Miocene Monterey Formation displaying arenaceous foraminifers (white). Arenaceous or "agglutinated" benthic foraminifers build their shells of grains of silt that are glued together instead of the usual calcite of most foraminifera.