It might not hurt to remind people submitting photos that some sort of
scale (ruler, coin, fingernail, etc.) and as much locality data as
possible would help a lot in identifications.

3: Some of the pictures suggest that there is internal structure in
the cylindrical parts.  It might be a coral (rugosan or tabulate), but
the resolution isn't quite high enough to tell.

5: 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.

6: Mytilidae; I don't have a handy reference on the exact species
present in Peru with sculpture like that, but a couple of the
Brachidontes species listed in Keen are similar.  This would probably
be an intertidal species, fairly convenient for people to harvest and
then dump the shells after their dinner of mussels marinara or
whatever the local equivalent was.

7: Probably a pteriomorph bivalve with strong concentric sculpture,
such as an inoceramid.


--
Dr. David Campbell
425 Scientific Collections
University of Alabama
"I think of my happy condition, surrounded by acres of clams"

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