Bed A - Los Pololos [Navidad Formation] (Miocene of Chile)

Where: Chile (33.9° S, 71.9° W: paleocoordinates 34.8° S, 66.4° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Navidad Formation, Early/Lower Miocene (23.0 - 16.0 Ma)

• STRATIGRAPHIC RELATIONS: From the Navidad Fm, for which lithostratigraphic relationships are not discussed (in english) in text. AGE: Early-Middle Miocene in text based on macrofossil biostratigraphy. Here, tentatively assigned to Early Miocene based on basal position with formation. STRATIGRAPHIC POSITION: From lower part of Navidad Fm.

• bed-level stratigraphic resolution

Environment/lithology: coastal; shelly/skeletal siltstone

• ENVIRONMENT: Shallow marine, on the basis of faunal composition.
• SPECIFIC LITHOLOGY: Fossiliferous siltstone. LITHIFICATION: Unknown.

Size class: macrofossils

Collected by Covacevich & Frassinetti

Collection methods: surface (in situ),

• COLLECTOR: Presumably V. Covacevich and D. Frassinetti. R, prior to 1980. REPOSITORY: SGO.

Primary reference: D. Frassinetti and V. Covacevich. 1981. Architectonicidae en la Formacion Navidad, Mioceno, Chile central. Parte 1. Heliacinae (Mollusca: Gastropoda). Revista Geológica de Chile 13-14:35-47 [A. Hendy/A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 78552: authorized by Austin Hendy, entered by Austin Hendy on 08.02.2008

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for bivalvia and gastropoda. NOMENCLATURE: Authoritative publication, and with taxonomic assignments to species and subgenus resolution.
 Arcida - Glycymerididae
Glycymeris colchaguensis Hupé 1854 clam
 Pectinida - Pectinoidae
Chlamys sp. Röding 1798 scallop
 Ostreida - Pinnidae
Pinna sp. Linnaeus 1758 oyster
 Cardiida - Mactridae
Mactra pusilla Philippi 1887 clam
Mactra oblonga Philippi 1887 clam
 Cardiida - Veneridae
Chione volckmanni, Dosinia semilaevis, "Pitar (Pitarella) sp." = Agriopoma
Chione volckmanni Philippi 1887 venus clam
Dosinia semilaevis Philippi 1887 venus clam
"Pitar (Pitarella) sp." = Agriopoma Dall 1902 venus
 Cardiida - Tellinidae
"Tellina" sp. Linnaeus 1758 tellin clam
 Cardiida - Lahillidae
"Lahillia (Lahillia) angulata" = Lahillia angulata
"Lahillia (Lahillia) angulata" = Lahillia angulata Philippi 1887 clam
 Protobranchia - Nuculanidae
Nuculana (Nuculana) "sp. 1" Link 1807 pointed nut clam
 Opisthobranchia - Bullidae
 Opisthobranchia - Cylichnidae
Scaphander brevicula Philippi 1887 snail
Scaphander remondi Philippi 1887 snail
 Neogastropoda - Olividae
Lamprodomina dimidiata Sowerby 1846 olive snail
 Neogastropoda - Buccinidae
 Neogastropoda - Nassariidae
Nassarius sp. Duméril 1806 snail
 Neogastropoda - Drilliidae
? Clavus sp. Monfort 1810 snail
 Littorinoidea - Littorinidae
 Naticoidea - Naticidae
Sinum subglobosus Sowerby 1846 moon snail
 Calyptraeoidea - Calyptraeidae
Crepidula sp. Lamarck 1799 slipper shell
 Tonnoidea - Personidae
"Distorsio cf. thersites" = Distorsio ringens
"Distorsio cf. thersites" = Distorsio ringens Philippi 1887 snail
 Sorbeoconcha - Turritellidae
Turritella ambulacrum Sowerby 1846 turret shell
 Pyramidelloidea - Pyramidellidae
 Dentaliida - Dentaliidae
Dentalium sp. Linnaeus 1758 tusk shell
Bryozoa indet. Ehrenberg 1831
 Lamniformes - Lamnidae
Lamna sp. Cuvier 1816 mackerel shark