PROCEEDINGS OF THE CALIFORNIA ACADEMY OF SCIENCES Fourth Series V^OL. XVIII, No. 4, pp. 73-213, plates 8-23 March 29, 1929 IV MARINE MIOCENE AND RELATED DEPOSITS OF NORTH COLOMBIA BY FRANK M. ANDERSON Contents Page Introduction 74 Post-Eocene Sequence 75 Poso Series 76 Structures 82 Stratigraphic relations 83 Age of the Poso series 85 The Miocene Series 86 Las Perdices group 89 The Tubera group 91 Local occturences 93 Comparison of horizons 95 Galapa-La Popa group 98 Pliocene Deposits 99 Correlations 102 Description of Species 105 Gastropoda 106 Pelecypoda 146 Foraminif era 179 March 29, 1929
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