Table of Contents

Articles

• You have access

  The nature of Paleozoic crustal instability in eastern North America

  Charles Schuchert

  American Journal of Science December 1920, s4-50 (300) 399-414; DOI: https://doi.org/10.2475/ajs.s4-50.300.399
• You have access

  Notes on the Tertiary intrusives of the lower Pecos Valley, New Mexico

  Douglas Ramsay Semmes

  American Journal of Science December 1920, s4-50 (300) 415-430; DOI: https://doi.org/10.2475/ajs.s4-50.300.415
• You have access

  Entelodonts in the Marsh Collection

  E. L. Troxell

  American Journal of Science December 1920, s4-50 (300) 431-445; DOI: https://doi.org/10.2475/ajs.s4-50.300.431
• You have access

  The rhyolites of Lipari

  H. S. Washington

  American Journal of Science December 1920, s4-50 (300) 446-462; DOI: https://doi.org/10.2475/ajs.s4-50.300.446