Negritos [Saman Conglomerate, Saman Fm] (Eocene of Peru)

Where: Piura, Peru (4.7° S, 81.3° W: paleocoordinates 10.8° S, 107.5° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Saman Conglomerate Member (Saman Formation), Late/Upper Eocene (37.2 - 33.9 Ma)

• LITHOSTRATIGRAPHY: From the Saman Conglomerate of the Saman Fm, which regionally overlies the Restin Fm of the Parinas Gp (Middle Eocene). AGE: Late Eocene (p. 9), on the basis of molluscan biostratigraphy. Foraminifera suggest an upper Eocene age. Olsson states that the Talara and Saman rocks can be referred to the Upper Eocene and in terms of the European section, to the Bartonian and Ludian.....respectively? STRATIGRAPHIC POSITION: From unknown position within formation.

• group of beds-level stratigraphic resolution

Environment/lithology: coastal; poorly lithified conglomerate

• ENVIRONMENT: Shelfal siliciclastic environment.
• LITHOLOGY: Conglomerate. LITHIFICATION: Poorly lithified, on the basis of figured specimens.

Size class: macrofossils

Collected by Olsson; reposited in the PRI

Collection methods: surface (in situ),

• COLLECTOR: Not stated, but presumably A. Olsson. REPOSITORY: Not stated, but presumably PRI

Primary reference: A. A. Olsson. 1928. Contributions to the Tertiary paleontology of northern Peru: Part 1. Bulletins of American Paleontology 14(52) [A. Miller/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 88391: authorized by Austin Hendy, entered by Austin Hendy on 10.04.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for bivalves, gastropods, and brachiopods. NOMENCLATURE: Authoritative publication, but with somewhat antiquated nomenclature.
Bivalvia
 Pholadida - Corbulidae
"Corbula boggsi n. sp." = Juliacorbula boggsi, "Corbula salina n. sp." = Caryocorbula salina
"Corbula boggsi n. sp." = Juliacorbula boggsi Olsson 1928 clam
"Corbula salina n. sp." = Caryocorbula salina Olsson 1928 clam
 Cardiida - Veneridae
Callocardia salvia, "Pitaria (Lamelliconcha) salsola n. sp." = Lamelliconcha hillii, "Clementia peruviana" = Clementia (Egesta) peruviana
Callocardia salvia Olsson 1928 venus clam
"Pitaria (Lamelliconcha) salsola n. sp." = Lamelliconcha hillii Dall 1895 venus clam
"Clementia peruviana" = Clementia (Egesta) peruviana Olsson 1928 venus clam
Gastropoda
 Ptenoglossa - Epitoniidae
Epitonium (Acrilla) peruvianum n. sp. Olsson 1928 wentletrap
 Neogastropoda - Buccinidae
Pseudoliva modesta n. sp. Olsson 1928 true whelk
 Neogastropoda - Nassariidae
"Alectrion terebratula n. sp." = Tritiaria terebratula, "Alectrion salina n. sp." = Nassarius salina
"Alectrion terebratula n. sp." = Tritiaria terebratula Olsson 1928 snail
"Alectrion salina n. sp." = Nassarius salina Olsson 1928 snail
 Neogastropoda - Volutidae
"Voluta (Peruluta) peruviana" = Peruluta peruviana, Lyria sabulosa n. sp.
"Voluta (Peruluta) peruviana" = Peruluta peruviana Douvillé 1921 volute
SUBSPECIES: Voluta (Peruluta) peruviana samanica
Lyria sabulosa n. sp. Olsson 1928 volute
 Stromboidea - Strombidae
Ectinochilus gaudichaudi d'Orbigny 1842 true conch
SUBSPECIES: Ectinochilus gaudichaudi alauda
 Ficoidea - Ficidae
"Pyrula otaria n. sp." = Ficopsis otaria
"Pyrula otaria n. sp." = Ficopsis otaria Olsson 1928 fig shell
 Naticoidea - Naticidae
Natica (Natica) peruviana n. sp. Olsson 1928 moon snail
Polinices (Polinices) woodsi n. sp. Olsson 1928 moon snail
 Cypraeoidea - Eocypraeidae
"Ovula negritensis n. sp." = Sphaerocypraea negritensis
"Ovula negritensis n. sp." = Sphaerocypraea negritensis Olsson 1928 snail
 Cypraeoidea - Cypraeidae
"Cypraea boggsi n. sp." = Cypraeorbis boggsi
"Cypraea boggsi n. sp." = Cypraeorbis boggsi Olsson 1928 cowry
 Tonnoidea - Cassidae
"? Sconsia samanica n. sp." = Doliocassis samanica
"? Sconsia samanica n. sp." = Doliocassis samanica Olsson 1928 snail