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Nine members are described in this volume. A model for Grand Cycle sedimentation is proposed, nine trilobite zonules are defined, and 95 species representing 38 genera are described.
1919/28 cumulation includes material previously issued in the 1919/20-1935/36 issues and also material not published separately for 1927/28. 1929/39 cumulation includes material previously issued in the 1929/30-1935/36 issues and also material for 1937-39 not published separately.
"A description and partial revision of the physical stratigraphy and interpretations of depositional environments."--T.p.