Tufolitas Laguna del Hunco: Early/Lower Eocene, Argentina

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Angiospermae - Myrtales - Myrtaceae
Eucalyptus spp. multi organs
Gandolfo et al. 2011
Localities: LH4, LH6, LH13, LH15, LH25, LHF, LH27
Angiospermae - Proteales - Proteaceae
Proteaceae indet. de Jussieu 1789
gen. et sp. indet
Orites bivascularis Romero et al. 1988
Lomatia preferruginea Berry 1938
Lomatia occidentalis Frenguelli 1943
Angiospermae - Laurales - Atherospermataceae
Atherospermophyllum guinazui leaf Knight and Wilf 2013
Knight and Wilf 2013
comb. nov., localities LH6, LH13, LH23, LH25, (Wilf, 2003); LH27 (Gandolfo, 2011)
Angiospermae - Laurales - Monimiaceae
Monimiophyllum callidentatum n. sp. leaf Knight and Wilf 2013
Knight and Wilf 2013
Morphotype TY027, unknown dicot sp. Wilf et al. 2005
Polypodiopsida - Osmundaceae
Todea amissa n. sp. leaf Carvalho et al. 2013
Carvalho et al. 2013
Equisetopsida - Araucariaceae
Agathis zamunerae multi organs Wilf et al. 2014
Wilf et al. 2014
unclassified
? Embothrium pregrandiflorum Berry 1938
Roupala patagonica Durango de Cabrera and Romero 1988
see common names

Geography
Country:Argentina State/province:Chubut
Coordinates: 42.5° South, 70.0° West (view map)
Paleocoordinates:45.0° South, 60.0° West
Basis of coordinate:stated in text
Geographic resolution:outcrop
Time
Period:Paleogene Epoch:Eocene
Stage:Ypresian 10 m.y. bin:Cenozoic 2
Key time interval:Early/Lower Eocene
Age range of interval:56.00000 - 47.80000 m.y. ago
Age estimate:52.2 ± 0.22 Ma (Ar/Ar)
Stratigraphy
Stratigraphy comments: middle Chubut River volcanic-pyroclastic complex.
According to Carvalho et al. 2013:
40Ar/39Ar analyses of single sanidine crystals from a volcanic ash bed located within the densely sampled portion of the section yielded an early Eocene age of 52.2 +- 0.22 Ma, further supported by the detection of two paleomagnetic reversals, and two other, low resolution Ar/Ar ages from the same section for the most recent synopsis, see Wilf et al., 2003, 2005; Wilf, 2012). From the combined evidence, 52.2 Ma is the best available working age for the entire flora.
Lithology and environment
Primary lithology: lithified tuff
Lithology description: tuffaceous caldera-lake deposits
Environment:crater lake
Taphonomy
Modes of preservation:body,adpression
Size of fossils:macrofossils
Collection methods and comments
Collection methods:survey of museum collection
Reason for describing collection:paleoecologic analysis
Collection method comments: Studied material comes from collections at the Museo Paleontológico Egidio Feruglio, Chubut, Argentina (MPEF-Pb); National Museum of Natural History, Smithsonian Institution, USA (USNM); Museo de Ciencias Naturales de La Plata, Buenos Aires, Argentina (LPPb); Fundación Miguel Lillo, Tucumán, Argentina (LilPb), and Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina (FCENCBPB).
Metadata
Database number:153415
Authorizer:C. Jaramillo Enterer:P. Santamarina, C. Jaramillo
Modifier:F. Aspromonte Research group:paleobotany
Created:2013-12-16 09:02:05 Last modified:2024-03-21 10:00:51
Access level:authorizer only Released:2018-12-16 09:02:05
Creative Commons license:CC BY
Reference information

Primary reference:
49452. C. C. Gonzalez, M. A. Gandolfo, M. C. Zamaloa, N. R. Cúneo, P. Wilf and K. R. Johnson. 2007. Revision of the Proteaceae macrofossil record from Patagonia, Argentina. The Botanical Review 73(3):235-266 [C. Jaramillo/P. Santamarina]

Secondary references:

55786 M. R. Carvalho, P. Wilf, E. J. Hermsen, M. A. Gandolfo, N. R. Cúneo and K. R. Johnson. 2013. First record of Todea (Osmundaceae) in South America, from the early Eocene paleorainforests of Laguna del Hunco (Patagonia, Argentina). American Journal of Botany 100:1831-1848 [C. Jaramillo/C. Jaramillo]
55853 M. A. Gandolfo, E. J. Hermsen, M. C. Zamaloa, K. C. Nixon, C. C. González, P. Wilf, N. R. Cúneo and K. R. Johnsosn. 2011. Oldest Known Eucalyptus Macrofossils Are from South America. Plos One 6(6):e21084 [C. Jaramillo/C. Jaramillo/C. Jaramillo]
56100 C. Knight and P. Wilf. 2013. Rare leaf fossils of Monimiaceae and Atherospermataceae (Laurales) from Eocene Patagonian rainforests and their biogeographic significance. Palaeontologia Electronica 16(3):26A-39 p. [C. Jaramillo/C. Jaramillo]
55854 P. Wilf, N. R. Cúneo, K. R. Johnson, J. F. Hicks, S. L. Wing and J. D. Obradovich. 2003. High Plant Diversity in Eocene South America: Evidence from Patagonia. Science 300(5616):122-125 [C. Jaramillo/C. Jaramillo/C. Jaramillo]
55856 P. Wilf, I. H. Escapa, N. R. Cúneo, R. M. Kooyman, K. R. Johnson and A. Iglesias. 2014. First South American Agathis (Araucariaceae), Eocene of Patagonia. American Journal of Botany 101(1):156-179 [C. Jaramillo/C. Jaramillo]