There was an enormous & destructive lightning fire in the Santa Cruz mountains in 2020 called the CZU complex: https://www.mercurynews.com/2022/08/16/two-years-later-czu-f...
I am not sure how complete the map is, but I suspect that the GP means the fires (such as the 1985 Lexington fire) further east mapped in red? Of those, I think I only see two meaningfully overlapped by newer fires (2009 and 2016 Loma fires overlapping 1985 Lexington, 2020 Park within the footprint of the 1985 Finley fire).
Edit: looks like the Finley/Park fires are technically just east of the mountain range, at least per http://www.scmbc.org/map-of-bioregion.