Later Marching Camps?

[Nathan Ross]

At first they justified dating it into the Vespasianic Era, but later finds there in a larger contex strongly advocated dating it "late".
(e.G. "Mayener Ware" pottery which Dr. B. Heukemes linked to the 4th century)

Thanks again! That would imply there's no discernable difference between a 4th c camp and one of 200 years before. Interesting that it's pottery once again providing the date estimate.

we'd be careful, I think, considering the use of "abandoned" fortresses from the High Empire as marching/temporary camps in "late" times for earnest

Very true - successive Roman armies would probably have used the same or similar routes into enemy territory, marched similar distances and therefore constructed camps in similar locations: we see this layering of fortifications where successive camps are of different sizes, but possibly if the old trench lines were just redug on the same plan - or, as you say, surviving fortifications reused - perhaps it wouldn't be so easy to make out the difference in date.