Table of Contents

Articles

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  Origin of clouded red feldspars; petrologic contrasts in a granitic porphyry intrusion

  Gary M. Boone

  American Journal of Science June 1969, 267 (6) 633-668; DOI: https://doi.org/10.2475/ajs.267.6.633
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  New potassium-argon age determinations relevant to the Miocene fossil mammal sequence in east Africa

  W. W. Bishop, J. A. Miller and F. J. Fitch

  American Journal of Science June 1969, 267 (6) 669-699; DOI: https://doi.org/10.2475/ajs.267.6.669
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  Petrology and chemistry of meta-igneous rocks in the Albemarle area, North Carolina slate belt

  J. Robert Butler and Paul C. Ragland

  American Journal of Science June 1969, 267 (6) 700-726; DOI: https://doi.org/10.2475/ajs.267.6.700
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  Ultramafic and related rocks [book review]

  D. S. Coombs

  American Journal of Science June 1969, 267 (6) 727; DOI: https://doi.org/10.2475/ajs.267.6.727
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  Pleistocene geology and biology [book review]

  A. L. Bloom

  American Journal of Science June 1969, 267 (6) 727-A-728; DOI: https://doi.org/10.2475/ajs.267.6.727-A