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When I was a kid I found this bivalve fossil and now looking at it, I think it lived attached to something on one side. You can see how one of the shells is deformed in a wierd way. Is it a known and common phenomenon? Also I would like if one of you can help me get an ID on this bivalve.

Found in a limestone pocket located in a debris pile West of Pueblo Colorado. A small section has been broken during removal exposing solid crystal of some sort. It is still attached to a portion of limestone. Would appreciate any thoughts.

Hello, from Armenohori area, near Moni, 5km from sea, usual chalk, chert, white looking earth. Photos of side and back as well. its like a tile.

Does anyone know of any instances -- or suspected instances -- of organisms that are known only from associated fossils, i.e. organisms that left absolutely no trace (i.e. 'xenobiont'), but are detectable from various epibionts that were once attached? In the Pennsylvanian of Kansas City, there are thin limestone beds in the lower Wea Shale that contain an abundance of Crurithyris brachiopods and ammovertellid forams that range persistently at least for several tens of miles. From south Kansas City, MO: From Excelsior Springs, MO, approximately 30 miles to the north: The ammovertellids are the little white things, and the Crurithyris are the bluish bb-like shells. Normally, in other strata, these fossils are sparse or only locally present. I didn't think much of these beds until I read that both fossil types have been found as epibionts attached to calcareous algae (both) and echinoids (Crurithyris). (See http://palaios.geoscienceworld.org/content/18/4-5/435.abstract and PDF at http://www.kgs.ku.edu/Current/2005/sawin/sawinandwest.pdf (page 9) ). This made me wonder if there were some soft bodied organism (perhaps sea-grass-like algae) that were present in abundance but left no trace -- carbon films, impressions, root/holdfast impressions, etc -- but did leave behind a mess of formerly attached shells. I can imagine vast 'gardens' stretching over wide expanses of the shelf.