Data: Hi - we found this near Porter, WA, there were lots of these little shells embedded in the rocks, any ideas?

Thank you for your consideration!
Kristin

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Identified:

Discussions:

• There's a Porter, Washington, that's a classic Oligocene locality.
  http://ia340924.us.archive.org/0/items/paleontologyofol00palmrich/paleontologyofol00palmrich.pdf
  will provide some useful (though dated) information-unfortunately the photos submitted aren't too clear or distinctive; carefully removing the sediment to expose the shell would help but might not be easy. ......Dr. David C.