Engelhardt, Donald W. Palynology of the Heath Formation (Miocene) from the Progreso Basin, Peru - Tulsa, OK American Association of Petroleum Geologists February 1993 - pp. 316 ISSN: 0149-1481 Subjects--Topical Terms: MIOCENOPALINOLOGIAPOLEN Y ESPORAS Subjects--Geographic Terms: PERUTUMBES Subjects--Index Terms: CUENCA PROGRESO FORMACION HEATH