Selva Alegre [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 to the upper Esmeraldas (Punta Gorda facies) and the Tumbez of Peru.

• formation-level stratigraphic resolution

Environment/lithology: marginal marine; lithified, coarse-grained conglomerate

• The molluscan fossils would seem to indicate a lagoonal to fully marine environment of deposition, the fossiliferous beds of irregular or patchy occurrence.
• The base of the formation is a coarse conglomerate exposed at Selva Alegre.

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 60752: authorized by Arnold Miller, entered by Kate Bulinski on 22.05.2006

Creative Commons license: CC BY (attribution)

Taxonomic list

• only a few taxa noted from this locality. not likely to be the complete fauna
Show authors, comments, and common names
Gastropoda
 Neogastropoda - Conidae
Conus mompichiensis, Conus angosturis
Conus mompichiensis cone shell
new species
Conus angosturis Olsson 1964 cone shell
alegris new subspecies
Bivalvia
 Arcida - Arcidae
"Anadara (Diluvarca) colomba" = Anadara (Tosarca) columba
"Anadara (Diluvarca) colomba" = Anadara (Tosarca) columba Olsson 1932 ark