Subibaja Formation (unspecified localities) (Miocene of Ecuador)

Where: Guayas, Ecuador (2.1° S, 80.5° W: paleocoordinates 3.3° S, 76.3° W)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Subibaja Formation, Early/Lower Miocene (23.0 - 16.0 Ma)

• LITHOSTRATIGRAPHU: From the undifferentiated Subibaja Fm, which underlies the Progresso Fm (Middle Miocene). AGE: Upper Early Miocene. Age is approximately equivalent to the Burdigalian stage based on correlation with other S. and C. American faunas. STRATIGRAPHIC POSITION: Composite list for formation.

• formation-level stratigraphic resolution

Environment/lithology: coastal; poorly lithified, fine-grained, glauconitic, micaceous, pyritic, sandy, carbonaceous siltstone

• Shallow-water siliciclastic facies of typically tropical composition.
• LITHOLOGY: Shale, siltstone, and fine-grained sandstone. Chiefly greenish-gray, friable to moderately indurated siltstone with shaly and sandy facies. Pyrite, glauconite, mica, and carbonaceous fragments common throughout. LITHIFICATION: Poorly lithified, on the basis of facies description.

Size class: macrofossils

Collection methods: COLLECTORS: Unknown. REPOSITORY: Unknown.

Primary reference: W. P. Woodring. 1957. Geology and Paleontology of Canal Zone and adjoining parts of Panama. United States Geological Survey Professional Paper 306(A) [A. Miller/A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 96513: authorized by Austin Hendy, entered by Austin Hendy on 10.06.2010

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Limited to taxa miscellaneously mentioned in text. NOMENCLATURE: Authoritative publication, with modern nomenclature, and species-resolution identifications.
Show authors, comments, and common names
Gastropoda
 Cerithioidea - Turritellidae
Turritella gatunensis
Turritella gatunensis Conrad 1857 turret shell
 Neogastropoda - Columbellidae
Anachis (Suturoglypta) cimarroma2, Sincola (Sincola) pequenita2
Sincola (Sincola) pequenita2 Marks 1951 snail
 Neogastropoda - Turridae
Gemmula vaningeni3
Gemmula vaningeni3 Brown and Pilsbry 1913 turrid
 Sorbeoconcha - Bursidae
Marsupina freya1
Marsupina freya1 Olsson 1932 frog shell
Bivalvia
 Cardiida - Leptonidae
Temblornia virgata4
Temblornia virgata4 Gardner 1942 clam
 Cardiida - Veneridae
Chione (Chionopsis) propinqua4, Lamelliconcha cora4
Chione (Chionopsis) propinqua4 Spieker 1922 venus clam
Lamelliconcha cora4 Brown and Pilsbry 1911 venus clam
1Beu 2010; 2Jung 1989; 3Woodring 1970; 4Woodring 1982