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BTChronostratigraphic Units
 .Phanerozoic
 ..Mesozoic
 ...Cretaceous
 ....Lower Cretaceous
 .....Trinity Group
BTChronostratigraphic Units
 .Phanerozoic
 ..Mesozoic
 ...Cretaceous
 ....Comanchean
 .....Trinity Group
RTLouisiana
 Oklahoma
 Texas
 Antlers Sands
 Arkansas
 Glen Rose Formation
 Paluxy Formation
 Pearsall Formation
 Rodessa Formation
 Travis Peak Formation
SNLower Cretaceous. Subdivided into (ascending) Pearsall, Rodessa, Ferry Lake, and Rusk time-stratigraphic units. In SW Arkansas, NW Louisiana, central S and SE Oklahoma, and Texas. This term has multiple hierarchies.