Photo quiz: what is this?

Hello,

I think I'm probably in the correct group but if not please don't
shoot me but refer me to the right place, ok? A relative I never heard
of died recently. I think he was a geologist. My parents found some
digital images that must have something to do with his work, These
photos really fascinate me and I would like to know what's on them.
Some of these thingies look like shells or snails, there are many
small rounded bubbles, maybe plant parts, others I don't even have an
idea what they might be.

Please can you tell me what I'm looking at? I uploaded them here:
http://s182.photobucket.com/albums/x271/thingyphotos/

Thanks a lot,

Dani :)

.

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