1) This was a specialist term for an oak tree at a certain number of years’ growth.
1672 blackbarkes now standing and groweing, Tong
1690 blackbarkes or polls already marked and ring’d abowt for standing, Tong
1720 reserving … eight Black Barks in every acre, Carlton. The Leeds Mercury of January 12, 1730 had the following advertisement: And to be sold a Spring Wood at Mirfield called the Great Hagg, with all the Lordings and Black Barks therein .