Posorja fauna, Guayas: Early Oligocene - Late Oligocene, Ecuador

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Gastropoda - Ampullinidae
Gastropoda - Naticidae
Gastropoda - Neogastropoda - Terebridae
Terebra sp. Bruguière 1789
Gastropoda - Neogastropoda - Thaisidae
Gastropoda - Neogastropoda - Olividae
Gastropoda - Neogastropoda - Buccinidae
Phos sp. Monfort 1810
Siphonalia sp. Adams 1863
Gastropoda - Neogastropoda - Pseudolividae
Gastropoda - Cerithiidae
Cerithium sp. Bruguière 1789
Gastropoda - Turritellidae
Gastropoda - Epitoniidae
Epitonium sp. Bolten 1798
Gastropoda - Neotaenioglossa - Calyptraeidae
Crepidula sp. Lamarck 1799
Bivalvia - Cardiida - Tellinidae
Tellina (Angulus) sp. (Megerle 1811)
Bivalvia - Cardiida - Veneridae
Bivalvia - Arcida - Arcidae
see common names

Geography
Country:Ecuador State/province:Guayas
Coordinates: 2.7° South, 80.3° West (view map)
Paleocoordinates:2.0° South, 72.0° West (Wright 2013)
Geographic resolution:outcrop
Time
Period: Paleogene Epoch: Oligocene
Stage: Rupelian - Chattian 10 m.y. bin: Cenozoic 4
Key time interval: Early Oligocene - Late Oligocene
Age range of interval: 33.9 - 23.04 m.y. ago
Stratigraphy
Formation:Posojra
Local section:Guayas River
Regional section:Guayas
Stratigraphic resolution:formation
Stratigraphy comments: SOURCE: composite assemblage from small exposures exposed along Guayas River. AGE: Some workers have placed this unit into the Miocene, but the fauna shows no affinities with the Miocene faunas of Zorritos and Amen. More affinity exists with the basal Heath Shale or Calet Mero and possibly equivalent to the Punta Barvo or Heath shales.
Lithology and environment
Primary lithology: lithified sandstone
Includes fossils?Y
Lithology description: GENERAL LITHOLOGY:sandstone; lithified based on figures.
Environment:marine indet.
Geology comments: ENVIRONMENT: no environmental data reported.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Collection methods:selective quarrying,field collection,survey of museum collection,observed (not collected)
Reason for describing collection:general faunal/floral analysis
Collection method comments: COLLECTOR: unknown collectors, presumably this is a composite of some collecting effort. REPOSITORIES: unknown repsotories
Taxonomic list comments:IDENTIFIER: A.A. Olsson. COVERAGE: probably not exhaustive, but nevertheless lengthy for gastropoda and bivalvia. No other groups mentioned. NOMENCLATURE: antiquated, but largely identified to species resolution.
Metadata
Database number:61201
Authorizer:A. Hendy Enterer:A. Hendy
Modifier:A. Hendy Research group:marine invertebrate
Created:2006-05-30 18:30:59 Last modified:2025-02-22 15:12:02
Access level:the public Released:2006-05-30 18:30:59
Creative Commons license:CC0
Reference information

Primary reference:
17581. G. Shepard. 1937. The geology of south-western Ecuador. Published by AAPG; lists some otherwise unpublished faunal lists, identified by Woodring and Vaughan; nomenclature is antiquated. [A. Miller/A. Hendy]