F9 - Puerto Madryn Fm: Late/Upper Miocene, Argentina

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Bivalvia - Arcida - Glycymerididae
Glycymeris (Glycymerita) magna n. sp. del Rio 1992
Bivalvia - Pectinida - Pectinidae
Amussium paris n. sp.
corrected as Amusium
Aequipecten paranensis (d'Orbigny 1842)
Bivalvia - Lucinida - Lucinidae
Pteromyrtea danieli
del Rio 1994
Bivalvia - Pholadida - Corbulidae
Caryocorbula pulchella
del Rio 1994
original and current combination Corbula (Caryocorbula)
Bothrocorbula (Hexacorbula) caduca n. sp.
del Rio 1994
spelled with current rank as Hexacorbula
Bivalvia - Cardiida - Corbiculidae
Polymesoda (Egeta) solobris
del Rio 1994
Bivalvia - Cardiida - Veneridae
Ameghinomya meridionalis Sowerby 1846
del Rio 1994
Dosinia (Dosinia) meridionalis
del Rio 1994
Pitar (Pitar) laziarina
del Rio 1994
Bivalvia - Cardiida - Mactridae
Spisula (Mactromeris) longa n. sp.
del Rio 1994
original and current combination Mactromeris
see common names

Geography
Country:Argentina
Coordinates: 43.0° South, 64.3° West (view map)
Paleocoordinates:43.1° South, 61.9° West
Basis of coordinate:based on nearby landmark
Geographic resolution:outcrop
Time
Period:Neogene Epoch:Miocene
10 m.y. bin:Cenozoic 6
Key time interval:Late/Upper Miocene
Age range of interval:11.63000 - 5.33300 m.y. ago
Stratigraphy
Formation:Puerto Madryn
Stratigraphic resolution:bed
Stratigraphy comments: STRATIGRAPHIC RELATIONS: From the Puerto Madryn Fm, which unconformably overlies the Gaiman Fm (Early Miocene). THICKNESS: From 4 m thick bed within 29 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 near top of section.
Lithology and environment
Primary lithology:very fine,fine,shelly/skeletal,gray unlithified calcareous sandstone
Includes fossils?Y
Lithology description: SPECIFIC LITHOLOGY: Grey, fine to very fine calcareous sandstone with lenses of grey fine-grained sandy shell beds containing a well-preseved skeletal fauna. LITHIFICATION: Unlithified based on figured specimens.
Environment:coastal indet.
Geology comments: ENVIRONMENT: Shallow marine tidal and subtidal environment with frequent storm processes superimposed.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Preservation of anatomical detail:excellent
Collection methods and comments
Collection methods:field collection
Reason for describing collection:taxonomic analysis
Collection method comments: COLLECTOR: C. J. del Rio (between 1982 and 1987). REPORSITORY: CPBA; Universidad de Buenos Aires. Ciudad Universitaria, Pabellon II, Buenos Aires, Argentina.
Taxonomic list comments:COVERAGE: Exhaustive for only bivalvia; other groups not discussed. NOMENCLATURE: Authoritative publication with modern nomenclature and species/subgenus resolution assignments.
Metadata
Database number:71548
Authorizer:A. Hendy Enterer:A. Hendy
Modifier:A. Hendy Research group:marine invertebrate
Created:2007-04-29 13:23:52 Last modified:2013-11-25 13:37:23
Access level:authorizer only Released:2008-04-29 13:23:52
Creative Commons license:CC BY
Reference information

Primary reference:
24178. 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]

Secondary references:

24183 C. J. del Rio. 1994. Middle Miocene bivalves of the Puerto Madryn Formation, Valdes Peninsule, Chubut Province, Argentina (Lucinidae-Pholadidae): Part 2. Palaeontographica Abteilung A 231:93-132 [A. Hendy/A. Hendy]