Archaeology Shetland has found 6,000 years worth of archaeology in the isles, but one hotspot in particular faces going underwater.
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Nice finds. I'm over on Lewis just now. Sea levels haven't risen here at all. Or in Galloway. Or on the Ayrshire coast. Or anywhere I have seen or heard of in Scotland. My friend at work comes from Skaill in Orkney. Sea levels have not risen there in the slightest. Coastal erosion takes place but that is just a natural process of erosion and deposition which Time and Tide do... I learned about it in Higher Geography in the 1970's.
Today I photographed a wonderful black charcoal filled lens around 6 feet wide and two feet deep about 8 feet down on an eroding cliff near Barabhas. It still has sections of what looks like burnt wooden planking jutting out of it. I was checking Georeferenced Mapping to see if there were any early OS maps showing anything in that zone. The current aerial photos match the high tides lines of 1832. No rising sea levels here at all.
Didn't see much of sea levels rising in Barra or Vatersay, heaven help us if the sea level rises to Mingulay's height and like you have seen the same for myself in Harris/Lewis, but erosion on the coast of the Western Isles, Orkney etc, is as you say a natural process.
Have been on Colonsay walking the raised beaches there. Sea level rise to former levels: waaaaaay to go. Not a trace.