Bonebed Z183 belongs to the lower portion of the Lifua Member of the Manda Formation. The bonebed is located in a gully, and is surrounded by pinkish-grey cross-bedded sandstone containing well-rounded quartz pebbles. The sandstone is overlain near the top by reddish-brown and olive-grey siltstone in a digit-like pattern characteristic of point bars; most of the vertebrate remains are concentrated within a section of this overlap. Discontinuous veins, or stringers, of brown claystone are also present. This layer has been biostratigraphically correlated to Subzone B of the South African "Cynognathus" Assemblage Zone, which is situated in the Anisian epoch of the Triassic period. This makes "Teleocrater" the oldest known bird-line archosaur, preceding the previous record-holder "Asilisaurus".