The fauna of these lenses is characterized from three cladistians (Serenoichthys kemkemensis and two other unnamed genera), an indeterminate actinopterygian, and the oldest known freshwater acanthomorph (Spinocaudichthys oumtkoutensis). The paleoenvironment of OT1 has been interpreted as a quiet lake, where the process of fossilization was quite rapid (soft tissues are generally preserved).