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Contributions, Spring 1989, 27.1

In this issue:

  • Presence of rounded boulders and large cobbles at base of White River Group (Oligocene) strata in Southwest North Dakota and Northwest South Dakota
  • Distribution of the Planomalinidae and the Schackoinidae in Upper Cretaceous strata of the Western Interior
  • Stratigraphic occurrence of rodents and lagomorphs in the Orella Member, Brule Formation (Oligocene), northwestern Nebraska
  • Diagenetic pathways of sandstone and shale sequences
  • Stratigraphy, sedimentary structures, and petrology of the middle Proterozoic Castner Marble, Franklin Mountains, far West Texas