Where: Argentina (48.3° S, 67.7° W: paleocoordinates 49.0° S, 61.2° W)
• coordinate based on nearby landmark
• local area-level geographic resolution
When: Chenque Formation, Early/Lower Miocene (23.0 - 16.0 Ma)
• STRATIGRAPHIC RELATIONS: From upper beds of the Monte Leon Fm. THICKNESS: From multiple beds within part of formation of less than 100 m. AGE: Early Miocene according to molluscan biostratigraphy. Assigned to the Early Miocene based on the the recognition of the upper PA assemblage. STRATIGRAPHIC POSITION: From uppermost part of the formation.
• group of beds-level stratigraphic resolution
Environment/lithology: coastal; poorly lithified sandstone
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 71430: authorized by Austin Hendy, entered by Austin Hendy on 25.04.2007
Creative Commons license: CC BY (attribution)
Taxonomic list
unclassified | |
Gastropoda | |
Actaeon argentinus Ihering 1907 snail | |
Gibbula margaritoides top snail
Calliostoma santacruzense top snail
Calliostoma cossmani top snail
Calliostoma peraratum top snail | |
Tegula americanus snail | |
Volvulella cannada Ihering 1907 snail | |
"Turritella" ambulacrum Sowerby 1846 turret shell | |
Tenagodus cossmani Ihering 1907 snail | |
Crepidula gregaria slipper shell | |
Cirsotrema rugulosa wentletrap | |
Ataxocerithium juliana snail | |
Penion subrecta true whelk
"Siphonalia" noachina true whelk | |
? Oamaruia gracilis snail
Sveltia major Ihering 1899 snail | |
Austroimbricaria quemadensis Ihering 1897 mitre shell | |
Zeacuminia santacrucensis auger snail | |
"Eoturris unifascialis" = Eopleurotoma, "Eoturris sanatacrucensis" = Eopleurotoma
"Eoturris unifascialis" = Eopleurotoma turrid
"Eoturris sanatacrucensis" = Eopleurotoma turrid | |
Adelomelon cannada volute | |
"Xymenella elegans" = Xymene murex snail
Trophon santacrucensis Ihering 1897 murex snail
"Urosalpinx" ortmanni murex snail
"Urosalpinx" cossmanni Ortmann 1900 murex snail | |
Bivalvia | |
Crassostrea hatcheri Ihering 1899 oyster | |
Hedecardium philippi Ihering 1897 cockle | |
Tellina (Tellina) jeguaensis, "? Tellinella patagonica" = Tellina (Tellinella)
Tellina (Tellina) jeguaensis tellin clam
"? Tellinella patagonica" = Tellina (Tellinella) tellin clam | |
Dosinia meridonalis Ihering 1897 venus clam | |
Corbula juliana clam | |
"Solen (Eosolen) crucis" = Solena (Eosolen)
"Solen (Eosolen) crucis" = Solena (Eosolen) clam | |
"Lucina" dalli Ihering 1907 clam | |
Pleuromeris sp. Conrad 1867 clam
Pleuromeris cannada clam |