 Fossils of "Sorbus" genus and "Rhus" genus leaves that show evidence of being interspecies hybrids have been noted from the formation.Flynn, DeVore and Pigg in 2019 described four species of sumac which formed multiple hybrids.The neuropteran insects (lacewings and their allies) identified as of 2014 include species from the families Berothidae, Chrysopidae, Hemerobiidae, Ithonidae (including Polystoechotidae), Nymphidae, Osmylidae, and Psychopsidae.