Abstract
During Leg 8 of the Deep Sea Drilling Project several almost complete Tertiary sections were collected in the equatorial Pacific. Examination of this material has led to great improvements in the radiolarian stratigraphy. An evolutionary lineage is proposed for a group of species belonging to the stratigraphically important genus Calocycletta. This group of six species ranged from the Late Oligocene to the Late Miocene in the equatorial fauna.
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