Climate in the Iron Age

[Gaius Sempronius Gracchus]

Thank you to Brennus and TiagoJRToledo. I read bits and pieces about this but there doesn't seem to be very much literature on the differences between what is and what was. I know that silting has had an effect on river courses and that erosion has had effects on coastlines etc.

Brennus, when you say that Yorkshire's coastline was greater...I was under the impression that there were flood-plains around the humber, and that there was a great deal of marshland, particularly in North Yorkshire. Am I wrong (or was that at a later date)?

Of particular interest to me is the coastline/rivers/marshes around East Anglia (particularly Norfolk). Any good sources for this kind of thing?