Marine fossil ID please

[Bradley Flynn]

Any ideas on these two fossils? Found at a local pit just outside of my town, marine deposits near Karoo basin.

[Fossildude19]

First looks like a brachiopod imprint. 

The others look like internal molds of bivalves. 

[Bradley Flynn]

Thanks

[Bradley Flynn]

Quick question. Are imprints and internal molds trace fossils? None of the actual organism is there, no shell in this case, just a negative and positive mold of the organism that was. 

[jpc]

no, they are simply impressions.  Trace fossils record some sort of movement (footprints) or behavior (burrows).

[Bradley Flynn]

Thanks for making it clear. Learning so much, really enjoying it.