There’s lots of oil under Los Angeles.
the flyash is very valuable as a cement additive for concrete
and the sulfur is good for making black powder for ordnance
“ There’s lots of oil under Los Angeles.”
The La Brea área has a considerable amount of oil. I met the captain of an oil exploration ship many years ago. He stated that there was so much oil off the coast of Southern California that it would take years to map it all.