Clark, B.L. (1938) Fauna of the Markley Formation (Upper Eocene) on Pleasant Creek, California. Bulletin of the Geological Society of America, 49, 683–730.
page(s): 705-706, pl. 3, figs 31, 36 [details]
Squires, R.L. (1999). Middle Eocene Brackish-Marine Mollusks from the Matilija Sandstone at Matilija Hot Springs, Ventura County, Southern Carolina <em>Contributions in Science</em>. 480: 1-30
page(s): 16 [details]
From editor or global species database
Type locality Vacaville (Pleasant Creek, near Brink ranch), California, United States; Markley Formation, middle Eocene [details]