Intrigued, a bit of Google searching turned up a lot of information.
Hakai Magazine
Global News
Scientific American.com
This paper includes a wealth of information and background. Living Landscapes - Biodiversity of the Central Coast
Locations of the sites - from the paper above.

We visited EjTa4 in the dinghy. The digs were not active and had all been temporarily covered over - I suppose to stop curious people like ourselves from falling in! All the Culturally Modified Trees (CMT) from the maps could be seen. The feeling of standing were people had lived for over 10,000 years was amazing.
One of the digs - temporarily filled in |
Culturally Modified Trees (CMTs) |
Early evening the fog started drifting in from the ocean, and with it the temperature dropped quickly to a low of 52F. Looking down Kwakshua channel inland one could see it was still blue sky there. I expect it was still hot too.
The fog starts drifting in over the island |