Marks (1951) Loc. # 532 (Progreso Fm): Early/Lower Miocene, Ecuador

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Bivalvia - Cardiida - Veneridae
Chione (Lirophora) informal sp. B (Conrad 1863)
original and current combination Lirophora
Dosinia delicatissima Brown and Pilsbry 1913
recombined as Dosinia (Dosinia) delicatissima
Clementia dariena (Conrad 1855)
recombined as Clementia (Clementia) dariena
Bivalvia - Hiatellida - Hiatellidae
Panope cf. coquimbensis
corrected as Panopea
Gastropoda - Heterostropha - Architectonicidae
Architectonica sexlinearis (Nelson 1870)
synonym of Architectonica nobilis
Gastropoda - Turritellidae
Turritella altilirata Grzybowski 1899
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:61061
Authorizer:A. Hendy Enterer:A. Hendy
Research group:marine invertebrate
Created:2006-05-29 11:16:37 Last modified:2013-11-25 13:37:23
Access level:the public Released:2006-05-29 11:16:36
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]