Okla. Stat. tit. 60, § 60-71: Appointment of trustee where there are contingent

remainders.

In any case where, by will or deed or other instrument, title to

real estate is in a tenant for life or other person having the right

to the use thereof and income therefrom, with the remainder interest

left to one or more contingent remaindermen, so that it is

impossible to determine until the death of the life tenant or the

future happening of some other determining event, what interest, if

any, the various contingent remaindermen will take; the district

court, upon the application of the life tenant, shall have

jurisdiction and authority to appoint a trustee under proper bond,

over said real estate, for the purpose of leasing the same for oil

and gas developing purposes.