SJE5 - Puerto Madryn Fm (Miocene of Argentina)

Where: Argentina (44.5° S, 65.3° W: paleocoordinates 44.7° S, 62.8° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Puerto Madryn Formation, Late/Upper Miocene (11.6 - 5.3 Ma)

• STRATIGRAPHIC RELATIONS: From the Puerto Madryn Fm, which unconformably overlies the Gaiman Fm (Early Miocene). THICKNESS: From a 3 m thick bed within 44 m thick section. Formation reaches a maximum thickness of 150 m. AGE: Middle Miocene according to del Rio (1992) on the basis of generic affinities with Middle Miocene Caribbean faunas. Regarded as Late Miocene by del Rio (2004). STRATIGRAPHIC POSITION: From middle part of section.

• bed-level stratigraphic resolution

Environment/lithology: coastal; unlithified, shelly/skeletal, gray, yellow, silty sandstone

• ENVIRONMENT: Shallow marine tidal and subtidal environment with frequent storm processes superimposed.
• SPECIFIC LITHOLOGY: Massive, yellowish, grey silty to very fine-grained sandstones with a rich and well preserved bivalve fauna. LITHIFICATION: Unlithified based on figured specimens and facies description.

Size class: macrofossils

Collection methods: COLLECTOR: C. J. del Rio (between 1982 and 1987). REPORSITORY: CPBA; Universidad de Buenos Aires. Ciudad Universitaria, Pabellon II, Buenos Aires, Argentina.

Primary reference: C. J. del Rio. 1992. Middle Miocene bivalves of the Puerto Madryn Formation, Valdes Peninsule, Chubut Province, Argentina (Nuculidae-Pectinidae): Part 1. Palaeontographica Abteilung A 225:1-58 [A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 71558: authorized by Austin Hendy, entered by Austin Hendy on 29.04.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for only bivalvia; other groups not discussed. NOMENCLATURE: Authoritative publication with modern nomenclature and species/subgenus resolution assignments.
 Arcida - Arcidae
Arca (Arca) particularis n. sp. del Rio 1992 ark
Anadara (Rasia) bravardi de Rio 1987 ark
 Cardiida - Veneridae
"Ameghinomya argentina" = Leukoma, Dosinia (Dosinia) cuspidata n. sp.
"Ameghinomya argentina" = Leukoma venus clam
Dosinia (Dosinia) cuspidata n. sp. venus clam
 Nuculida - Nuculidae