Marks (1951) Loc. # 7500-A (Progreso Fm): Early/Lower Miocene, Ecuador

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Bivalvia - Pectinida - Pectinidae
Pecten amenensis
Bivalvia - Carditida - Crassatellidae
Eucrassatella peruviana
Bivalvia - Lucinida - Lucinidae
Lucinisca sp. Dall 1901
spelled with current rank as Lucina (Lucinisca)
Anodontia stainforthi
Bivalvia - Cardiida - Tellinidae
Tellina amenensis
Bivalvia - Cardiida - Veneridae
Dosinia delicatissima Brown and Pilsbry 1913
recombined as Dosinia (Dosinia) delicatissima
Pitar aff. cosanguineus
Pitar (Lamelliconcha) sp. Dall 1902
Clementia dariena (Conrad 1855)
recombined as Clementia (Clementia) dariena
Bivalvia - Cardiida - Anatinellidae
Anatina undulata (Gould 1851)
recombined as Raeta undulata
Bivalvia - Hiatellida - Hiatellidae
Panope cf. coquimbensis
corrected as Panopea
Gastropoda - Turritellidae
Turritella altilirata Grzybowski 1899
Turritella infracarinata Grzybowski 1899
recombined as Turritella (Turritella) infracarinata
Gastropoda - Naticidae
Polinices coronis (Hanna and Israelsky 1925)
synonym of Polinices stanislasmeunieri
Gastropoda - Neogastropoda - Thaisidae
Chorus cruziana
Gastropoda - Neotaenioglossa - Calyptraeidae
Crucibulum ecuadorense
see common names

Geography
Country:Ecuador State/province:Guayas
Coordinates: 2.3° South, 80.4° West (view map)
Paleocoordinates:3.5° South, 76.3° West
Basis of coordinate:based on nearby landmark
Geographic resolution:outcrop
Time
Period:Neogene Epoch:Miocene
10 m.y. bin:Cenozoic 5
Key time interval:Early/Lower Miocene
Age range of interval:23.03000 - 15.98000 m.y. ago
Stratigraphy
Formation:Progreso
Local section:Progreso
Local order:bottom to top
Regional section:Progreso
Stratigraphic resolution:bed
Stratigraphy comments: From Progresso Fm, which is of Middle Miocene age, overylies the Subibaja Fm (lower Early Miocene). The thickness of the formation is about 200 ft throughout its outcrop area. It is regionally correlated with the Variegated, Upper Zorritos, Cardalitos (Peru) and Onzole and Borbón (Ecuador) formations.
Lithology and environment
Primary lithology:pebbly,tuffaceous,green poorly lithified argillaceous,silty,conglomeratic,calcareous sandstone
Includes fossils?Y
Lithology description: Clay, silty, green sandstone; soft, silty, and silty shale, with local accumulations of bentonite, bentonitic shale, tuff, pebbly sandstone, oyster-rich sandstone with duriable calcareous cement, and fine conglomerate.
Environment:coastal indet.
Geology comments: Shallow marine and brackish water with typical tropical assemblage.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Collection excludes:all microfossils
Collection methods:field collection
Reason for describing collection:biostratigraphic analysis
Museum repositories:PRI
Collection method comments: Fossil material derived from the International Ecuadorian Petroleum Company (subsidiary of Standard Oil Co.) and was collected by the author (then employed by oil company) during field exploration and drilling operations. All type and voucher material reposited in PRI collections.
Taxonomic list comments:Exhaustive for gastropoda and bivalvia.
Metadata
Database number:61065
Authorizer:A. Hendy Enterer:A. Hendy
Research group:marine invertebrate
Created:2006-05-29 11:18:42 Last modified:2013-11-25 13:37:23
Access level:the public Released:2006-05-29 11:18:41
Creative Commons license:CC BY
Reference information

Primary reference:
17441. J. G. Marks. 1951. Miocene stratigraphy and paleontology of Southwestern Ecuador. Bulletins of American Paleontology 33(139):1-448 [A. Miller/A. Hendy]