Barro Colorado [Borbon Fm] (Miocene of Ecuador)

Where: Esmeraldas, Ecuador (1.1° N, 79.0° W: paleocoordinates 0.3° N, 76.2° W)

• coordinate based on political unit

• outcrop-level geographic resolution

When: Borbon Formation (Santiago Group), Middle Miocene (16.0 - 11.6 Ma)

• Possibly equivalent tot he upper Esmeraldas (Punta Gorda facies) and the Tumbez of Peru.

• formation-level stratigraphic resolution

Environment/lithology: lagoonal; lithified, tuffaceous shale and lithified sandstone

• The molluscan fossils would seem to indicate a lagoonal to fully marine environment of deposition, the fossiliferous beds of irregular or patchy occurrence.
• The formation is composed of a variable development of tuffaceous shale, soft sandstones and some conglomerates and at most places the stratification is horizontal or nearly so.

Size class: macrofossils

Primary reference: A. A. Olsson. 1964. Neogene Mollusks From Northwestern Ecuador [A. Miller/K. Bulinski]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 60751: authorized by Arnold Miller, entered by Kate Bulinski on 22.05.2006

Creative Commons license: CC BY (attribution)

Taxonomic list

Gastropoda
 Neogastropoda - Buccinidae
Perunassa sapotilla true whelk
new species
 Neogastropoda - Conidae
Conus cf. patricius Hinds 1843 cone shell
 Neogastropoda - Marginellidae
"Marginella sapotilla" = Prunum (Prunum) sapotilla
"Marginella sapotilla" = Prunum (Prunum) sapotilla Hinds 1844 margin shell
 Neogastropoda - Cancellariidae
"Cancellaria (Pyruclia) lacondamini" = Pyruclia lacondamini
"Cancellaria (Pyruclia) lacondamini" = Pyruclia lacondamini Olsson 1964 snail
new species
Bivalvia
 Arcida - Arcidae
Anadara (Cunearca) melita Olsson 1964 ark
new species
 Cardiida - Veneridae
Cyclinella cf. beteyensis Olsson 1922 venus clam
 Cardiida - Mactridae
Mulinia pallida Broderip and Sowerby 1829 clam
Harvella elegans Sowerby 1825 clam
 Cardiida - Anatinellidae
Raeta undulata Gould 1851 clam
 Cardiida - Tellinidae
Temnoconcha ecuadoriana tellin clam
new species