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Contributions, Spring 1979, 17.1

In this issue:

  • Geometry and origin of deformational structures in the Precambrian metamorphic rocks of the Hill City area, Black Hills, South Dakota
  • Silurian continental margin in northern Nevada and northwestern Utah
  • Vertebrate fauna of the Laramie Formation (Maestrichtian), Weld County, Colorado
  • K-Ar age for the Fowkes Formation (middle Eocene) of southwestern Wyoming
  • Description of a large trionychid turtle shell from the Eocene Bridger Formation of Wyoming
  • Angiosperms from the late Tertiary Keller local fauna of Ellis County, Kansas
  • Aspects of continental crustal structure and growth; targets for scientific deep drilling