1997  Titus, Webster, Manger & Dewey, p.208: 40 m long
           trench, 900 m E, 75 m S of Tippipah Spring 7.5
           min.quadr., approx. 116°11'10" W longitude, 37°02'31"
           N latitude. Low stand, prodeltaic sequence, highstand
           with condensed, conodont-rich ferruginous carbonate  
           wackestone. Goniatites: (1) unit 3-16, (2) 18-22, (3)
           22-23, (4) 24.
     2001  Titus & Manger: 4, fig.3, D. thalassoide BZ.