I had the opportunity to spend several weeks cruising the fjords of Norway a few years ago. I noticed one sheer wall that had a series of iron eyes driven in the rock roughly 20’-25’from the sea level. When we stopped for fuel, I asked the marina help what those eyes were for. His answer was fascinating. Those were hooks that were left over from 17th century whaling ships. I asked why they were so far from the waterline. He said because the waterline was so much higher in the 17th century.
Go figure.
That makes sense. The 1600s were a period sometimes called the Little Ice Age.