In the open sea, the deposition sites in sheltered bays are pretty obvious ( see early blogs)but within the estuarine conditions of Poole Harbour do these exist? These gastropod shells seem to collect along with shelly mud in the middle tide marks of the harbour and the sievings (0.1mm-0.9mm)from this material are quite rich in arenaceous as well as other foraminifera. I have washed and sieved out the shells so that identification is possible. They are somewhat larger than 10mm. Click on the image for an enlarged version.
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