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Volume 69 - Issue 12 - December 1932

Contents

Original Articles

  • Tertiary Orbitoids from North-Western Peru

  • J. U. Todd, E. Wright Barker
  • Published online by Cambridge University Press:
    01 May 2009, pp. 529-543

  • THE material to be described was collected by one of us while in the service of Lobitos Oilfields, Ltd., and was presented to the British Museum (Natural History). We owe our thanks to the Directors for allowing us to examine and report on the specimens, all of which were obtained from the neighbourhood of Lobitos.

  • The Origin of Igneous Rocks

  • Arthur Holmes
  • Published online by Cambridge University Press:
    01 May 2009, pp. 543-558

  • THE leading problems presented by igneous rocks are:—

    (a) the nature and sources of the primary magmas;

    (b) the mechanics of magmatic intrusion and emplacement; and

    (c) the processes which have brought about the manifold diversity of igneous rock-types.

Reviews

Correspondence

  • The Genesis of Leucite and Melilite Rocks

  • S. J. Shand
  • Published online by Cambridge University Press:
    01 May 2009, pp. 561-562
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Index

Front matter

  • GEO volume 69 issue 12 Front matter

  • Published online by Cambridge University Press:
    01 May 2009, pp. f1-f7
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