Where: Chile (44.6° S, 74.8° W: paleocoordinates 45.5° S, 69.3° W)
• coordinate based on nearby landmark
• outcrop-level geographic resolution
When: Ipún Beds Formation, Burdigalian (20.4 - 16.0 Ma)
• STRATIGRAPHIC RELATIONS: From the Ipún Beds, correlative with the Navidad Fm, for which lithostratigraphic relationships are not discussed (in english) in text. AGE: The age of the Navidad Formation and equivalent units has been a matter of debate for decades (see Gutiérrez et al. 2013; Finger et al. 2013, and Le Roux et al. 2013; references therein). An early Miocene age for the Navidad Formation was derived from studies on mollusks, shark teeth, Sr isotopes, and radiometric (Ar/Ar and K/Ar) dating of volcanic clasts in this unit (Gutiérrez et al. 2013; Finger et al. 2013; references therein). A middle to late Miocene or early Pliocene age for this unit had been interpreted from the study of foraminifers, ostracodes, pollen, Sr isotopes, and Ar/Ar dating of volcanic clasts (Finger et al. 2013 and references therein). Finger (2013) reexamined planktic foraminifers ascribed to the late Miocene and early Pliocene (in Finger et al. 2007), whereupon they recognized that they were misidentified and reassigned the assemblages to the early Miocene (Burdigalian Stage, ~21–16 Ma). Fossils in the Navidad Formation and correlative units yielded 87Sr/86Sr ages of 24–16 Ma (Nielsen and Glodny 2009). STRATIGRAPHIC POSITION: From unknown position within Navidad Fm.
• bed-level stratigraphic resolution
Environment/lithology: submarine fan; poorly lithified siliciclastic sediments
Size class: macrofossils
Collected by Covacevich & Frassinetti
Collection methods: surface (in situ),
• COLLECTOR: Presumably V. Covacevich and D. Frassinetti. R, prior to 1980. REPOSITORY: SGO.
Primary reference: V. Covacevich and D. Frassinetti. 1986. El genero Cancellaria en el Mioceno de Chile con descripcion de cuatro especies nuevas (Gaastropoda: Cancellariidae). Revista Geológica de Chile 28-29:33-67 [A. Hendy/A. Hendy]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 78525: authorized by Austin Hendy, entered by Austin Hendy on 07.02.2008, edited by Mihaela Krause, Damián Perez and Matthew Clapham
Creative Commons license: CC BY (attribution)
Taxonomic list
Echinoidea | |
"Schizaster" sp. Agassiz 1835 heart urchin | |
Bivalvia | |
Mactra sp. Linnaeus 1767 clam | |
Chione sp., "Ameghinomya volckmanni" = Ameghinomya volckmanni3, "Chione volckmanni" = Ameghinomya volckmanni
Chione sp. von Mühlfield 1811 venus clam
"Chione volckmanni" = Ameghinomya volckmanni Philippi 1887 venus clam | |
Cucullaea chilensis Philippi 1887 clam | |
Pinna sp. Linnaeus 1758 oyster | |
Scaphopoda | |
Dentalium aff. matanzasense tusk shell | |
Gastropoda | |
Scaphander sp. Monfort 1810 snail | |
"Bulla" sp. Linnaeus 1758 snail | |
Turritella sp. Lamarck 1799 turret shell | |
Semicassis monilifera Sowerby 1846 snail | |
| |
"Proscaphella vidali" = Miomelon
"Proscaphella vidali" = Miomelon volute | |
Cancellaria medinae Philippi 1887 snail | |
? Columbarium sp. von Martens 1881 snail | |
Lamprodomina dimidiata Sowerby 1846 olive snail | |
"Siphonalia subreflexa" = Austrosipho subreflexa Sowerby 1844 true whelk
Pseudoliva cepa true whelk
"Fusus" turbinelloides true whelk | |
Neverita sp. Risso 1826 moon snail | |
Cephalopoda | |
| |
Terebellina | |
Scolicia sp.2, Asterosoma sp.2, Phycosiphon sp.2, Ophiomorpha sp.2, Thalassinoides sp.2, Zoophycos sp.2, Nereites sp.2, Chondrites sp.2
Scolicia sp.2 de Quatrefages 1849
Asterosoma sp.2 von Otto 1854
Phycosiphon sp.2 von Fischer-Ooster 1858
Ophiomorpha sp.2 Lundgren 1891
Thalassinoides sp.2 Ehrenberg 1944
Zoophycos sp.2 Massalongo 1855
Nereites sp.2 MacLeay 1839
Chondrites sp.2 von Sternberg 1833 |