Kleinsasser, Lynnette L. al., et Supplemental material:  Stratigraphy and geochronology of the late Miocene Adu-Asa Formation at Gona, Ethiopia GSA Data Repository Item 2008193, Special Papers, Vol. 446, p. 38. File size: 61 p., about 618 KB. Geoscience 2008-01-01
    https://gsapubs.figshare.com/articles/book/Supplemental_material_Stratigraphy_and_geochronology_of_the_late_Miocene_Adu-Asa_Formation_at_Gona_Ethiopia/12346064
10.1130/2008193