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.
These include isolated teeth of the batoid genera Pseudohypolophus and Rhinobatos, along with isolated teeth and toothplates of several bony fishes including amiids, albulids, and pycnodonts.