This unit contained numerous large bivalves and a diverse vertebrate faunal assemblage similar to that contained within unit L, although turtle material and well-preserved toothplates of pycnodonts and albulid fishes are more common than seen in unit L.
The most commonly occurring fossils within this unit are bony fishes, consisting of numerous isolated scales and teeth, as well as toothplates of pycnodont and albulid fishes.
-- Albulid fishes are characterized by toothplates displaying phyllodont tooth replacement (Estes, 1969a, 1969b).
For example, albulid fish are relatively rare components of the sandstone formations of the Trinity Group (Huggins, 1990).
Studies on fossil phyllodont fishes: Casierius, a new genus of albulid from the Cretaceous of Europe and North America.