Cueva de Angostura [Angostura Fm] (Miocene of Ecuador)

Where: Esmeraldas, Ecuador (1.1° N, 79.0° W: paleocoordinates 0.7° N, 77.4° W)

• coordinate based on political unit

• outcrop-level geographic resolution

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

• Lowest of the Santiago Miocene section, lying transgressivlely unconformably on the Rio de Oro and Playa Rica shales. 150 meters in thickness

• formation-level stratigraphic resolution

Environment/lithology: shallow subtidal; lithified, coarse-grained sandstone and conglomerate

• Near-shore clastic sediments deposited along the inner shelf zone at depths of 100 fathoms or less.
• The Angostura formation is comprised primarily of coarse wsandstones and beds of conglomerates, about 150 meters in thickness. The formation is resistant to erosion and is largely barren, but at a few places there are lenses or interbeds filled with finely preserved fossils.

Size class: macrofossils

Collection methods: Faunal list observed from the fossils found in the roof of a small cave.

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 60640: authorized by Arnold Miller, entered by Kate Bulinski on 19.05.2006, edited by Austin Hendy

Creative Commons license: CC BY (attribution)

Taxonomic list

 Arcida - Arcidae
Calloarca (Taeniarca) cachla Olsson 1964 clam
new species
Anadara (Cunearca) boggsi Olsson 1964 ark
new species
Anadara (Cunearca) hindsi Olsson 1922 ark
"Lunarca cueva" = Anadara (Lunarca) ark
new species
 Arcida - Noetiidae
 Mytilida - Mytilidae
"Crenella ecuadoriana" = Crenella decussata
"Crenella ecuadoriana" = Crenella decussata Montagu 1808 mussel
subspecies santiaga, new subspecies
 Carditida - Crassatellidae
Eucrassatella (Hybolophus) berryi Spieker 1922 clam
subspecies telemba, new subspecies
Crassinella sp. Guppy 1874 clam
 Pholadida - Corbulidae
"Caryocorbula (Hexacoraula) hexacyma" = Hexacorbula hexacyma, "Caryocorbula (Caryocorbula) prenasuta" = Caryocorbula prenasuta
"Caryocorbula (Hexacoraula) hexacyma" = Hexacorbula hexacyma Brown and Pilsbry 1913 clam
"Caryocorbula (Caryocorbula) prenasuta" = Caryocorbula prenasuta Olsson 1964 clam
new species
 Cardiida - Chamidae
Arcinella arcinella Linnaeus 1767 jewel box
subspecies arcinella
 Cardiida - Kelliellidae
"Alveinus abundans" = Alveinus rotundus
"Alveinus abundans" = Alveinus rotundus Dall 1900 clam
new species
 Cardiida - Veneridae
"Chione (Panchione) mactropsis" = Lirophora (Panchione) mactropsis
"Chione (Panchione) mactropsis" = Lirophora (Panchione) mactropsis Conrad 1855 venus clam
 Cardiida - Semelidae
Ervilia meridionalis clam
new species
 Cardiida - Cardiidae
"Trachycardium (Trachycardium) dominicense" = Trachycardium (Dallocardia) dominicense, "Dinocardium (Exocardium) ecuadorialis" = Dinocardium ecuadoriale, "Trigoniocardia (Americardia) stewarti" = Americardia, Trigoniocardia (Trigoniocardia) hannai
"Trachycardium (Trachycardium) dominicense" = Trachycardium (Dallocardia) dominicense Gabb 1873 cockle
"Dinocardium (Exocardium) ecuadorialis" = Dinocardium ecuadoriale Olsson 1932 cockle
"Trigoniocardia (Americardia) stewarti" = Americardia cockle
new species
 Lucinida - Lucinidae
"Lucina (Lucinisca) arrogans" = Lucinisca, "Lucina (Callucina) quincula" = Callucina, Lucina (Lepilucina) gratis, Divaricella comis
"Lucina (Lucinisca) arrogans" = Lucinisca clam
new species
"Lucina (Callucina) quincula" = Callucina clam
new species
Lucina (Lepilucina) gratis Olsson 1964 clam
new species
Divaricella comis Olsson 1964 clam
new species
 Protobranchia - Nuculanidae
Nuculana (Saccella) crassatelloides Olsson 1964 pointed nut clam
new species
Adrana aegra Olsson 1964 pointed nut clam
new species
 Opisthobranchia - Cylichnidae
"Acteocina cf. subbullata" = Acteocina bullata
"Acteocina cf. subbullata" = Acteocina bullata Kiener 1834 barrel-bubble
 Neogastropoda - Olividae
Olivella (Niteoliva) marksi Olsson 1956 olive snail
 Neogastropoda - Olivellidae
Agaronia burchi snail
new species
 Neogastropoda - Buccinidae
Perunassa ? ursa true whelk
new species
Northia (Northia) ecuadoriana true whelk
new species
Cymatophos pilsbryi true whelk
new species
Hanetia (Solenosteira) dalli Brown and Pilsbry 1911 true whelk
 Neogastropoda - Nassariidae
Nassarius (Uzita) mastus snail
new species
 Neogastropoda - Cancellariidae
"Cancellaria (Euclia) maldonadoi" = Euclia maldonadoi, "Cancellaria (Pyruclia) telemba" = Pyruclia telemba, "Cancellaria (Hertleinia) angosturana" = Hertleinia angosturana
"Cancellaria (Euclia) maldonadoi" = Euclia maldonadoi Olsson 1964 snail
new species
"Cancellaria (Pyruclia) telemba" = Pyruclia telemba Olsson 1964 snail
"Cancellaria (Hertleinia) angosturana" = Hertleinia angosturana Marks 1949 snail
 Neogastropoda - Muricidae
"Murex (Murex) polynematicus" = Vokesimurex polynematicus
"Murex (Murex) polynematicus" = Vokesimurex polynematicus Brown and Pilsbry 1911 murex snail
 Neogastropoda - Conidae
Conus riosantiagensis cone shell
new species
Conus boggsi Olsson 1964 cone shell
new species
Conus angosturis Olsson 1964 cone shell
new species
 Neogastropoda - Terebridae
Strioterebrum oresignus auger snail
new species
Strioterebrum telembiense auger snail
new species
Strioterebrum gatunensis Toula 1908 auger snail
"Terebra (Paraterebra) cembra" = Terebra (Oreoterebra) subsulcifera cembra Olsson 1964 auger snail
new species
 Stromboidea - Strombidae
Strombus sp. Linnaeus 1758 conch
 Naticoidea - Naticidae
Stigmaulax kugleriana moon snail
new species
 Cypraeoidea - Cypraeidae
Muracypraea woodringi Landau and Groves 2011 cowry
 Vermetoidea - Vermetidae
Petaloconchus sculpturatus Lea 1846 worm shell
 Tonnoidea - Personidae
"Distorsio (Rhysema) gatunensis" = Distorsio decussata
"Distorsio (Rhysema) gatunensis" = Distorsio decussata Valenciennes 1832 snail
 Sorbeoconcha - Turritellidae
Turritella prenuncia Spieker 1922 turret shell
Turritella (Bactrospira) altilira Conrad 1857 turret shell
subspecies alitilira
Turritella gatunensis Conrad 1857 turret shell
Turritella (Broderiptella) mimetes Brown and Pilsbry 1911 turret shell
Turritella matarucana Hodson 1926 turret shell
 Architectonicoidea - Architectonicidae
"Architectonica (Architectonica) nobilis" = Architectonica nobilis
"Architectonica (Architectonica) nobilis" = Architectonica nobilis Röding 1798 sundial
subspecies nobilis