Picaderos [Picaderos Fm] (Miocene of Ecuador)

Where: Esmeraldas, Ecuador (0.8° N, 78.9° W: paleocoordinates 0.4° N, 77.3° W)

• coordinate based on political unit

• outcrop-level geographic resolution

When: Picaderos Formation (Santiago Group), Late/Upper Miocene (11.6 - 5.3 Ma)

• Overlies the Angostura sandstones and conglomerates 100meters thick

• formation-level stratigraphic resolution

Environment/lithology: marine; lithified, tuffaceous, green, blue shale

• softer formation consisting of blue-green tuffaceous shales approximately 100 meters thick and being less resistant to weathering and erosion

Size class: macrofossils

Collection methods: About 16 species are recorded from the formation which is probably only a small percentage of the whole molluscan fauna in the beds.

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 60675: authorized by Arnold Miller, entered by Kate Bulinski on 19.05.2006, edited by Austin Hendy

Creative Commons license: CC BY (attribution)

Taxonomic list

Gastropoda
 Cerithioidea - Cerithiidae
Alabina sp. Dall 1902 cerith snail
 Cerithioidea - Turritellidae
"Turritella altilira" = Turritella (Bactrospira) altilira
"Turritella altilira" = Turritella (Bactrospira) altilira Conrad 1857 turret shell
 Pseudomelanoidea - Pseudomelaniidae
Carinodrillia felis Olsson 1964 snail
 Neogastropoda - Buccinidae
Cymatophos armatus true whelk
new species
Hanetia (Solenosteira) dalli Brown and Pilsbry 1911 true whelk
"Antillophos cf. gatunensis" = Antillophos (Antillophos) candei gatunensis Toula 1909 true whelk
 Neogastropoda - Nassariidae
Nassarius (Uzita) mastus snail
new species
 Neogastropoda - Turridae
Gemmula vaningeni Brown and Pilsbry 1913 turrid
 Neogastropoda - Muricidae
"Typhis alatus" = Typhina alata
"Typhis alatus" = Typhina alata Sowerby 1850 murex snail
 Neogastropoda - Cancellariidae
"Cancellaria (Pyruclia) lacondamini" = Pyruclia lacondamini2, "Cancellaria (Cancellaria) dariena" = Bivetiella dariena, "Bivetiella dariena" = Bivetiella dariena3
"Cancellaria (Pyruclia) lacondamini" = Pyruclia lacondamini2 Olsson 1964 snail
"Cancellaria (Cancellaria) dariena" = Bivetiella dariena Toula 1908 snail
"Bivetiella dariena" = Bivetiella dariena3 Toula 1908 snail
 Sorbeoconcha - Cassidae
Sconsia grayi1 Adams 1855 snail
Bivalvia
 Mytilida - Crenellidae
"Crenella ecuadoriana" = Crenella decussata
"Crenella ecuadoriana" = Crenella decussata Montagu 1808 clam
santiaga new subspecies
 Cardiida - Kelliellidae
"Alveinus abundans" = Alveinus rotundus
"Alveinus abundans" = Alveinus rotundus Dall 1900 clam
new species
 Cardiida - Veneridae
"Callocardia cf. gatunensis" = Callocardia (Agriopoma) gatunensis
"Callocardia cf. gatunensis" = Callocardia (Agriopoma) gatunensis Dall 1903 venus clam
 Cardiida - Semelidae
Ervilia meridionalis clam
new species
 Carditida - Crassatellidae