Have the Paternoster Gang Investigates stories ever been collected in one volume?
also the flashbacks in Bloodtide take place I'd say after the Ark leaves Earth in the Prehistoric Era
I've added the flashbacks to 'Bloodtide' on the timeline after Silurian Ark leaves Earth as you suggested.
I'm not sure about the 'Paternoster Gang Investigates' stories. I've not seen a collected volume of those stories. I'm not very familiar with them, but if anyone wants to comment that there is a collected volume of 'PGI' then please say so.