Gastropods with predation or disease? What's the red?

[Lone Hunter]

Another rediscovery with my loop,  I would swear I'm looking at innards but I know better.  Not the usual broken shells I'm used to seeing, not the usual replacement, first time I've seen red on a fossil. What's going on in here? Oh and last pic, are those tiny gastropods? Smaller be than a pin head that's best shot I could get.

[Thomas.Dodson]

The red appears to be mineral replacement of the inner shell or interior, probably something with iron. The fact that it appears on both the gastropods and the ammonite(s) is a good indication of this. While I suspect the last pic is something I suspect greater magnification will be needed to tell what.