CAS Loc. 1305, Isla Baltra (Pliocene of Ecuador)

Where: Ecuador (0.4° S, 90.3° W: paleocoordinates 0.7° S, 92.2° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Pliocene (5.3 - 2.6 Ma)

• STRATIGRAPHIC RELATIONS: From unnamed lithostratigraphic unit, for which stratigraphic relationships are not discussed. AGE: Pliocene. STRATIGRAPHIC POSITION: The fossil-bearing bed on the south end of the bay on the west side of the island is about 3 meters (10 feet) thick and dips about 5° or 6° south. Large angular blocks of lava in the lower portion of the bed offer evidence of deposition very near the shore.

• bed-level stratigraphic resolution

Environment/lithology: marine; poorly lithified siliciclastic sediments

• SPECIFIC LITHOLOGY: Not stated in text, other than fossil bearing. LITHIFICATION: Poorly-lithified, based on figured specimens.

Size class: macrofossils

Collected by Slevin in 1927; reposited in the CAS

Collection methods: bulk, surface (in situ), sieve,

• COLLECTOR: J.R. Slevin, 1927. REPOSITORY: CAS.

Primary reference: L. G. Hertlein. 1972. Pliocene fossils from Baltra (South Seymour) Island, Galápagos Islands. Proceedings of the California Academy of Sciences 39(3):25-46 [A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 96595: authorized by Austin Hendy, entered by Austin Hendy on 13.06.2010

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for molluscs. NOMENCLATURE: Authoritative publication, with somewhat antiquated nomenclature, and species-resolution identifications.
Bivalvia
 Ostreida - Ostreidae
"Ostrea palmula" = Saccostrea palmula
"Ostrea palmula" = Saccostrea palmula Carpenter 1857 oyster
 Arcida - Arcidae
Arca pacifica Sowerby 1833 ark
 Cardiida - Chamidae
Chama species jewel box
 Cardiida - Veneridae
Chione sp. von Mühlfield 1811 venus clam
 Lucinida - Lucinidae
Ctena galapagana Dall 1901 clam
Anodontia spherica Dall and Ochsner 1928 clam
Gastropoda
 Sorbeoconcha - Hipponicidae
Hipponix pilosus hoof shell
 Neogastropoda - Muricidae
 Neogastropoda - Columbellidae
 Neogastropoda - Mitridae
Mitra gausapata mitre shell
Mitra lens mitre shell
 Sorbeoconcha - Tonnidae
Malea ringens Swainson 1822 tun shell
 Sorbeoconcha - Ranellidae
"Cymatium lineatum" = Reticutriton lineatus
"Cymatium lineatum" = Reticutriton lineatus Broderip 1833 triton shell
 Sorbeoconcha - Cypraeidae
"Cypraea nigropunctata" = Pseudozonaria nigropunctata
"Cypraea nigropunctata" = Pseudozonaria nigropunctata Gray 1828 cowry
 Cerithioidea - Cerithiidae
Cerithium adustum cerith snail
 Trochoidea - Tegulidae
Echinoidea
 Cidaroida - Cidaridae
"Eucidaris thouarsii" = Cidaris thouarsii
"Eucidaris thouarsii" = Cidaris thouarsii Valencienncs 1846 pencil urchin
 Clypeasteroida - Mellitidae
Encope micropora Agassiz 1841 sand dollar