Goedert, James L., and Richard L. Squires. "Eocene Deep-sea Communities in Localized Limestones Formed by Subduction-related Methane Seeps, Southwestern Washington." Geology 18 (1990): 1182-1185.

Filewicz, Mark V., and Richard L. Squires. Paleogene Stratigraphy, West Coast of North America. Vol. 58., 1988.