Where: Argentina (47.0° S, 66.7° W: paleocoordinates 47.7° S, 60.3° W)
• coordinate based on nearby landmark
• local area-level geographic resolution
When: San Julián Formation, Early/Lower Miocene (23.0 - 16.0 Ma)
• 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.
• group of beds-level stratigraphic resolution
Environment/lithology: coastal; poorly lithified, sandy limestone
Size class: macrofossils
Collection methods: 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.
Primary reference: 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]more details
Purpose of describing collection: biostratigraphic analysis
PaleoDB collection 71403: authorized by Austin Hendy, entered by Austin Hendy on 24.04.2007
Creative Commons license: CC BY (attribution)
Taxonomic list
unclassified | |
Gastropoda | |
Calliostoma garretti top snail | |
Tegula abavus snail
Tegula princeps snail | |
"Turritella" ambulacrum Sowerby 1846 turret shell | |
? Trichosirius patagonica Cossmann 1899 snail | |
Cirsotrema rugulosa wentletrap | |
""Polynices" secunda" = Polinices
""Polynices" secunda" = Polinices moon snail | |
"Fusus" stromeri snail | |
"Fusiguraleus pilsbry" = Neoguraleus (Fusiguraleus)
"Fusiguraleus pilsbry" = Neoguraleus (Fusiguraleus) snail | |
"Lyria" dalli Ihering 1907 volute | |
"Hadriania" jorgensis Ihering 1907 murex snail
Trophon santacrucensis Ihering 1897 murex snail | |
Struthiolarella ornata snail | |
"Siphonalia nodosocincta" = Sassia armata
"Siphonalia nodosocincta" = Sassia armata Hupé 1854 triton shell | |
Ficus carolina d'Orbigny 1847 fig shell | |
Bivalvia | |
Neilo (Neilo) ornata Sowerby 1846 clam | |
Modiolarca prisca clam | |
"Aulacomya cf. ater" = Aulacomya atra, Modiolus ameghinoi
"Aulacomya cf. ater" = Aulacomya atra Molina 1782 mussel
Modiolus ameghinoi Ihering 1907 mussel | |
"Chlamys" puntana, "Swiftopecten iheringii" = Chlamys (Swiftopecten) iheringii, Jorgechlamys juliana, Jorgechlamys centralis, "Zygochlamys geminatus" = Zygochlamys geminata, ""Chlamys" jorgensis" = Chlamys (Zygochlamys) jorgensis
"Chlamys" puntana scallop
"Swiftopecten iheringii" = Chlamys (Swiftopecten) iheringii del Rio 1995 scallop
Jorgechlamys juliana scallop
Jorgechlamys centralis Sowerby 1846 scallop
"Zygochlamys geminatus" = Zygochlamys geminata Sowerby 1846 scallop
""Chlamys" jorgensis" = Chlamys (Zygochlamys) jorgensis Ihering 1907 scallop | |
"Lima (Limatula) pisum" = Limatula, "Lima (Limatula) cossmanni" = Limatula, Neoinoceramus ameghinoi, "Lima (Limaria) patagonia" = Limaria
"Lima (Limatula) pisum" = Limatula file clam
"Lima (Limatula) cossmanni" = Limatula file clam
Neoinoceramus ameghinoi file clam
"Lima (Limaria) patagonia" = Limaria file clam | |
Pododesmus paucisquamatus scallop | |
Pinna (Atrina) magellanica Ihering 1907 oyster | |
Crassostrea hatcheri Ihering 1899 oyster | |
"Cucullaea darwini" = Cucullaria darwini
"Cucullaea darwini" = Cucullaria darwini Philippi 1887 clam | |
Cucullaea (Monteleonia) marshalli Zinsmeister 1981 clam | |
Limopsis insolita Sowerby 1846 clam | |
"Chione" patagonica, "Chione" eupyga, "Chione" casa, Dosinia meridonalis, Eumarcia aff. arenosa, Retrotapes scutata, Pitar julianum
"Chione" patagonica Philippi 1887 venus clam
"Chione" eupyga Ihering 1907 venus clam
"Chione" casa Ihering 1907 venus clam
Dosinia meridonalis Ihering 1897 venus clam
Eumarcia aff. arenosa venus clam
Retrotapes scutata venus clam
Pitar julianum venus clam | |
Corbula juliana clam | |
"Lucina" ortmanni Ihering 1899 clam | |
Crassatella kokeni clam
Spissatella longior clam | |
"Fasciculicardia inaequalis" = Glyptoactis (Fasciculicardia), Pleuromeris sulcolunularis
"Fasciculicardia inaequalis" = Glyptoactis (Fasciculicardia) clam |