Okla. Stat. tit. 16, § 16-71: Marketable record title defined

Any person having the legal capacity to own land in this state,

who has an unbroken chain of title of record to any interest in land

for thirty (30) years or more, shall be deemed to have a marketable

record title to such interest as defined in Section 78 of this

title, subject only to the matters stated in Section 72 of this

title. A person shall be deemed to have such an unbroken chain of

title when the official public records disclose a conveyance or

other title transaction, of record not less than thirty (30) years

at the time the marketability is to be determined, which said

conveyance or other title transaction purports to create such

interest, either in

(a) the person claiming such interest, or

(b) some other person from whom, by one or more conveyances or

other title transactions of record, such purported interest has

become vested in the person claiming such interest; with nothing

appearing of record, in either case, purporting to divest such

claimant of such purported interest.