Cal. Bus. & Prof. Code § 7847

The board, upon application therefor, on its prescribed form, and upon the payment of the fee fixed by this chapter, which shall be retained by the board, may issue a certificate of registration as a geologist or as a geophysicist to a person holding an equivalent certificate of registration as a geologist or as a geophysicist, issued to him or her by any state or country when the applicant’s qualifications meet the other requirements of this chapter and the rules established by the board.