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. Introduction- Fieldwork and acknowledgments. Changes in formation and age assignments. Additions to annotated bibliography, Additions to localities at which fossils were collected New generic and subgeneric names. Gastropod faunal summaries and age of formations. ____ Eocene series.. Gatuncillo formation. Eocene or Oligocene series. Marine member of Bohio(?) formation .- Oligocene series__----_--____-____ Bohio formation. Caimito formation. Caraba formation. Panama formation-____-___--__ Miocene series Culebra formation. Cucaracha formation.. La Boca formation, including Emperador limestone member. Alhajuela formation.. Gatun formation.-----_ Chagres sandstone, including Toro limestone member_  Holocene series.-_____ Informally designated Atlantic and Pacific muck_ Page 299

u.s. geological survey professional papers/u.s. geological survey professional paper

Geology and paleontology of Canal Zone and adjoining parts of Panama; description of Tertiary mollusks (Gastropods: Eulimidae, Marginellidae to Helminthoglyptidae)