The Petrolia Formation is a geologic formation in Texas. It preserves fossils dating back to the Permian period.
Paleontology The Petrolia Formation has provided a rich vertebrate fauna. Many fossils were originally assigned to the Belle Plains Formation, although this formation is now considered synonymous with the Petrolia Formation. It is regarded as Early Leonardian in age based on ammonite biostratigraphy. Tit Mountain was once regarded as part of the now defunct Belle Plains Formation.
+Synapsids of the Petrolia FormationGenus LocalitiesSpeciesDimetrodonTit Mountain Tit MountainD.natalis D.limbatusA small species of Dimetrodon. Large species of Dimetrodon.SecodontosaurusTit MountainS. obtusidensA sphenacodontid.OphiacodonTit MountainO.retroversusAn ophiacodontid.EdaphosaurusTit MountainE.crucigerAn edaphosaurid.EothyrisTit MountainE.parkeyiA primitive synapsid.VaranosaurusTit MountainV.wichitaensisA varanopid.LupeosaurusTit MountainL. kayiAn edaphosaurid.CtenospondylusC. caseiA sphenacodontid.
Chondricthyes +Cartilaginous Fish of the Petrolia FormationGenus SpeciesNotesOrthacanthusO.platypternusA xenacanthid.BarbclaborniaB.luederensisA giant xencanth.
Amphibia +Amphibians of the Petrolia FormationGenusSpeciesNotesZatrachysZ.spA temnospondyl.ArcheriaA.sp.An embolomere.TrimerorhachisT.bilobatusA dvinosaur.EryopsE.sp.A temnospondyl.ParioxysP. sp.A temnospondyl.
Reptiliomorpha +Reptiliomorphs of the Petrolia FormationGenusSpeciesNotesDiadectesD.sp.A diadectid.
See also
List of fossiliferous stratigraphic units in Texas Paleontology in Texas
References