A: Old Lootsberg Pass in South Africa. B: Measured-section transect showing paleomagnetic (Paleomag) sample sites and porcellanite location on the Blaauwater 87 farm, Eastern Cape Province. Global positioning system (GPS) located positions and Smith and Botha-Brink (2014) vertebrate samples and the vertebrate-defined Permian-Triassic boundary (PTB) (dotted line) relative to our section are shown. New paleontological collections are marked. Drill sites for magnetostratigraphy are shown by closed circles. RR—railroad; PNC—pedogenic nodule conglomerate. All GPS coordinates are World Geodetic System 1984 (WGS 84) standard; base map is 3124DD Lootsberg 1:50,000 South Africa, Council for Geoscience, Pretoria.
Lithostratigraphy, magnetostratigraphy (numbered sites; N—normal polarity), and paleontology of the Old Lootsberg Pass section; global positioning system coordinates for the base and top of our section are provided (for details, see the Data Repository [see footnote 1]). Vertebrate collection number, systematic identification, and stratigraphic position of Smith and Botha-Brink (2014) specimens below their Permian-Triassic boundary (PTB) (dotted red line) are marked. Question marks represent specimens of postcranial material where systematic identification is uncertain. Mbr—member; O. baini—Oudenodon baini; ss—sandstone; V.F.—very fine.
Karoo Basin lithostratigraphy and biostratigraphy, and biozone boundary dates for the base of the Cistecephalus and Dicynodon assemblage zones (Rubidge et al., 2013). The relative position of our isotope dilution–thermal ionization mass spectrometry (ID-TIMS) porcellanite age near the top of the Dicynodon zone (arrows) is placed against the global composite magnetic polarity time scale of Szurlies (2013) based on the magnetostratigraphy of the Old Lootsberg Pass, South Africa, section. The hypothesized stratigraphic position of the Permian-Triassic boundary is manifest somewhere in the Lystrosaurus assemblage zone in the Katberg Formation. Lithostratigraphic units and biozones are not drawn to scale. Mbr.—member; Fm.—formation.