On Sunday Alethea Patton, John Glavis and Michael Bunch laid cob, a mixture of soil, sand and straw, on a barrel oven now available for use in the pavillion at the recently transformed Burnt Park. David Briggs

The latest incarnation of a parcel of land in downtown Bolinas long known as Burnt Park received a finishing touch this weekend as volunteers installed a steel barrel oven covered in a natural building material called cob. Though the long-term maintenance plan for the lot remains unclear, the park has come a long way.

The roughly 50,000 square . . .