Bahia Mazarredo - San Julian Fm: Early/Lower Miocene, Argentina

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Fagnanoa dubiosa
Valdesia (Juliana) aequistriata
Gastropoda - Trochidae
Calliostoma garretti
Gastropoda - Tegulidae
Tegula abavus
Tegula princeps
Gastropoda - Opisthobranchia
? Priscaphander patagonica
Gastropoda - Turritellidae
"Turritella" ambulacrum Sowerby 1846
Gastropoda - Neotaenioglossa - Trichotropidae
? Trichosirius patagonica Cossmann 1899
Gastropoda - Epitoniidae
Cirsotrema rugulosa
Gastropoda - Naticidae
"Polynices" secunda
original and current combination Polinices
Gastropoda - Neogastropoda - Nassariidae
"Fusus" stromeri
Gastropoda - Neogastropoda - Mangeliidae
Fusiguraleus pilsbry
spelled with current rank as Neoguraleus (Fusiguraleus)
Gastropoda - Neogastropoda - Volutidae
"Lyria" dalli Ihering 1907
Gastropoda - Neogastropoda - Muricidae
"Hadriania" jorgensis Ihering 1907
Trophon santacrucensis Ihering 1897
Gastropoda - Struthiolariidae
Struthiolarella ornata
Gastropoda - Ranellidae
Siphonalia nodosocincta Ihering 1907
synonym of Sassia armata
Gastropoda - Ficidae
Ficus carolina (d'Orbigny 1847)
Bivalvia - Nuculanida - Malletiidae
Neilo (Neilo) ornata (Sowerby 1846)
Bivalvia - Mytilida - Crenellidae
Modiolarca prisca
Bivalvia - Mytilida - Mytilidae
Aulacomya cf. ater (Molina 1782)
recombined as Aulacomya atra
Modiolus ameghinoi (Ihering 1907)
Bivalvia - Pectinida - Pectinidae
"Chlamys" puntana
Swiftopecten iheringii del Rio 1995
recombined as Chlamys (Swiftopecten) iheringii
Jorgechlamys juliana
Jorgechlamys centralis (Sowerby 1846)
Zygochlamys geminatus (Sowerby 1846)
recombined as Zygochlamys geminata
"Chlamys" jorgensis (Ihering 1907)
recombined as Chlamys (Zygochlamys) jorgensis
Bivalvia - Pectinida - Limidae
Lima (Limatula) pisum
original and current combination Limatula
Lima (Limatula) cossmanni
original and current combination Limatula
Neoinoceramus ameghinoi
Lima (Limaria) patagonia
original and current combination Limaria
Bivalvia - Pectinida - Anomiidae
Pododesmus paucisquamatus
Bivalvia - Ostreida - Pinnidae
Pinna (Atrina) magellanica Ihering 1907
Bivalvia - Ostreida - Ostreidae
Crassostrea hatcheri (Ihering 1899)
Bivalvia - Arcida - Parallelodontidae
Cucullaea darwini (Philippi 1887)
recombined as Cucullaria darwini
Bivalvia - Arcida - Cucullaeidae
Cucullaea (Monteleonia) plana
Cucullaea (Monteleonia) marshalli Zinsmeister 1981
Bivalvia - Arcida - Limopsidae
Limopsis insolita (Sowerby 1846)
Bivalvia - Cardiida - Veneridae
"Chione" patagonica (Philippi 1887)
"Chione" eupyga Ihering 1907
"Chione" casa Ihering 1907
Dosinia meridonalis Ihering 1897
Eumarcia aff. arenosa
Retrotapes scutata
Pitar julianum
Bivalvia - Pholadida - Corbulidae
Corbula juliana
Bivalvia - Lucinida - Lucinidae
Pteromyrtea crucialis
"Lucina" ortmanni Ihering 1899
Bivalvia - Carditida - Crassatellidae
Crassatella kokeni
Spissatella longior
Bivalvia - Carditida - Carditidae
Fasciculicardia inaequalis
original and current combination Glyptoactis (Fasciculicardia)
Pleuromeris sulcolunularis
see common names

Geography
Country:Argentina
Coordinates: 47.0° South, 66.7° West (view map)
Paleocoordinates:47.7° South, 60.3° West
Basis of coordinate:based on nearby landmark
Geographic resolution:local area
Time
Period:Neogene Epoch:Miocene
10 m.y. bin:Cenozoic 5
Key time interval:Early/Lower Miocene
Age range of interval:23.03000 - 15.98000 m.y. ago
Stratigraphy
Formation:San Julián
Stratigraphic resolution:group of beds
Stratigraphy comments: STRATIGRAPHIC RELATIONS: From beds of the San Julián Fm, which unconformably overlies the Deseado Fm and is overlain by the Early Miocene Monte Leon Fm. THICKNESS: From multiple beds within formation that reaches a thickness of 80 m. AGE: Late Oligocene-Early Miocene according to molluscan biostratigraphy. Assigned to the Early Miocene based on the the recognition of the JR assemblage. STRATIGRAPHIC POSITION: From uppermost parts of the formation.
Lithology and environment
Primary lithology: poorly lithified sandy "limestone"
Includes fossils?Y
Lithology description: SPECIFIC LITHOLOGY: Sandy limestone. LITHIFICATION: Poorly-lithified on the basis of figured specimes.
Environment:coastal indet.
Geology comments: ENVIRONMENT: Environmental data not reported in text. Siliciclastic shallow marine assemblage.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Collection methods:field collection,survey of museum collection
Reason for describing collection:biostratigraphic analysis
Collection method comments: COLLECTOR: List includes both new collections by the author, and examination of museum and previously reported taxa. REPOSITORY: Museo Argentino de Ciencias Naturales Bernadino Rivadavia, Buenos Aires, Argentina.
Taxonomic list comments:COVERAGE: Exhaustive for bivalvia and gastropoda. NOMENCLATURE: Not an authoritaive publication, but providing revised generic placement for many previously reported antiquated names.
Metadata
Database number:71403
Authorizer:A. Hendy Enterer:A. Hendy
Research group:marine invertebrate
Created:2007-04-24 09:42:55 Last modified:2013-11-25 13:37:23
Access level:authorizer only Released:2007-04-24 09:42:54
Creative Commons license:CC BY
Reference information

Primary reference:
12860. C. J. del Rio. 2004. Tertiary Marine Molluscan Assemblages of Eastern Patagonia (Argentina): A Biostratigraphic Analysis. Journal of Paleontology 78(6):1097-1122 [L. Ivany/P. Wall/P. Wall]