Question: What sort of deposits does asphalt overlay?
Answer: On the west coast, as early as the 13th century, the Tongva, Luiseno and Chumash peoples collected the naturally occurring asphalt/bitumen that seeped to the surface above underlying petroleum deposits.
A single-select problem: Is the question answered in a satisfactory fashion?

(a). yes;
(b). no;
(a).