Long, J.A.; Niedźwiedzki, G.; Garvey, J.; Clement, A.M.; Camens, A.B.; Eury, C.A.; Eason, J.; Ahlberg, P.E.
range · taxonomy · morphology · geochronology · methods
Primary description and surface scanning of early Tournaisian clawed tracks. A probable primitive-sauropsid interpretation implies a crown-Amniota minimum near the Devonian–Carboniferous boundary, but the trackmaker has no body fossil.
Early Tournaisian clawed tracks from the Snowy Plains Formation make a near-Devonian/Carboniferous crown-Amniota minimum plausible under the cited trackmaker interpretation; the 358.9–0 Ma route is therefore contested evidence synthesis, not an exact fossil age or observed divergence.
claim:taxon:amniota:root-rangeThe 358.9–0 Ma Sauropsida route uses the Snowy Plains clawed trackway as a probable primitive-sauropsid minimum; because the trackmaker could lie near the amniote crown node, the endpoint is contested and not a body-fossil FAD or crown-birth date.
claim:taxon:sauropsida:root-range