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![Composite stratigraphic section through the Tufolitas Laguna del Hunco at Laguna del Hunco, revised from Wilf et al. (2003). Height in the composite section is measured in meters and reflects stratigraphic thickness corrected for bedding dip. Fossil localities (LH1-33), pollen sample C12 (Barreda et al. 2020), and Wilf et al. (2003) lithostratigraphic section bases (B–F; marked in the field by rebar posts) are shown in black. New U-Pb dates are shown in red, including the new U-Pb age for Ash 2211A, which previously produced an 40Ar-39Ar age of 52.22 ± 0.22 Ma. Note that section A of Wilf et al. (2003) is separated by a fault and not included in this profile.]()
![Field photographs of fossil-bearing lithofacies. (A) Overview of the Tufolitas Laguna del Hunco (Laguna del Hunco locality). (B) Laminated mudstone facies (Laguna del Hunco locality). (C) Photomicrograph of organic-rich laminated mudstone facies (Laguna del Hunco locality). (D) Gray ashy mudstone overlain by sediment gravity flow (resistant bed; Laguna del Hunco locality). (E) Photomicrograph showing microcrystalline nature of the gray ashy mudstone facies (Laguna del Hunco locality). (F) Leaf fossil preserved in gray ashy mudstone (Laguna del Hunco locality). (G) Volcaniclastic turbidite showing all five Bouma subdivisions (Laguna del Hunco locality). (H) Glass dome intruding gray ashy mudstone facies (Central Caldera locality). (I) Petrified tree trunk preserved in a clast-rich ash-flow tuff (Escuela Piedra Parada locality). (J) Root cast and cross-bedding in a crystal-rich reworked pyroclastic facies (Laguna Fría locality). (K) Field relationships among the Ignimbrita Barda Colorada, valley-filling volcaniclastic facies, orange ignimbrite, and Laguna Fría capping basalt (Laguna Fría locality). Fossil locality lies stratigraphically above the orange ignimbrite and below the basalt. (L) Oblique composite satellite image looking east at the area between the Laguna Fría and La Barda faunal localities (3× vertical exaggeration. Image used with permission; Image © 2019 Centre National d’Etudes Spatiales [CNES]/Airbus, © 2018 Google, Image © 2019 Maxar Technologies).]()
![Field photographs of fossil-bearing lithofacies. (A) Overview of the Tufolitas Laguna del Hunco (Laguna del Hunco locality). (B) Laminated mudstone facies (Laguna del Hunco locality). (C) Photomicrograph of organic-rich laminated mudstone facies (Laguna del Hunco locality). (D) Gray ashy mudstone overlain by sediment gravity flow (resistant bed; Laguna del Hunco locality). (E) Photomicrograph showing microcrystalline nature of the gray ashy mudstone facies (Laguna del Hunco locality). (F) Leaf fossil preserved in gray ashy mudstone (Laguna del Hunco locality). (G) Volcaniclastic turbidite showing all five Bouma subdivisions (Laguna del Hunco locality). (H) Glass dome intruding gray ashy mudstone facies (Central Caldera locality). (I) Petrified tree trunk preserved in a clast-rich ash-flow tuff (Escuela Piedra Parada locality). (J) Root cast and cross-bedding in a crystal-rich reworked pyroclastic facies (Laguna Fría locality). (K) Field relationships among the Ignimbrita Barda Colorada, valley-filling volcaniclastic facies, orange ignimbrite, and Laguna Fría capping basalt (Laguna Fría locality). Fossil locality lies stratigraphically above the orange ignimbrite and below the basalt. (L) Oblique composite satellite image looking east at the area between the Laguna Fría and La Barda faunal localities (3× vertical exaggeration. Image used with permission; Image © 2019 Centre National d’Etudes Spatiales [CNES]/Airbus, © 2018 Google, Image © 2019 Maxar Technologies).]()
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![Simplified geologic map of the study area, modified from Aragón and Mazzoni (1997), and sampling localities. La Barda locality is off the map, ∼6 km distant from the Laguna Fría locality on a 192° bearing (Tejedor et al., 2009). Solid lines represent observed boundaries from field work and satellite imagery. Dashed lines represent inferred boundaries. The resurgent dome area has not yet been mapped in detail but contains pyroclastic deposits of the Tufolitas del Hunco; intracaldera volcanic flows and dikes; and capping Miocene to Pleistocene basalt flows.]()
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Tufolitas Laguna del Hunco
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Journal Article
SEDIMENTOLOGICAL CONTROLS ON PLANT-FOSSIL PRESERVATION IN AN EOCENE CALDERA-LAKE FILL: A HIGH-RESOLUTION, AGE-CONSTRAINED RECORD FROM THE TUFOLITAS LAGUNA DEL HUNCO, CHUBUT PROVINCE, ARGENTINA Available to Purchase
Journal: PALAIOS
Publisher: SEPM Society for Sedimentary Geology
Published: 23 April 2025
PALAIOS (2025) 40 (4): 114–129.
...Elizabeth A. Hajek; J. Marcelo Krause; Peter Wilf; Mark D. Schmitz Abstract Caldera lake sediments of the early Eocene Tufolitas Laguna del Hunco (Chubut Province, Argentina) host one of the world’s best-preserved and most diverse fossil plant assemblages, but the exceptional quality...
FIGURES
Image
Composite stratigraphic section through the Tufolitas Laguna del Hunco at L... Available to Purchase
in SEDIMENTOLOGICAL CONTROLS ON PLANT-FOSSIL PRESERVATION IN AN EOCENE CALDERA-LAKE FILL: A HIGH-RESOLUTION, AGE-CONSTRAINED RECORD FROM THE TUFOLITAS LAGUNA DEL HUNCO, CHUBUT PROVINCE, ARGENTINA
> PALAIOS
Published: 23 April 2025
Fig. 3. Composite stratigraphic section through the Tufolitas Laguna del Hunco at Laguna del Hunco, revised from Wilf et al. (2003) . Height in the composite section is measured in meters and reflects stratigraphic thickness corrected for bedding dip. Fossil localities (LH1-33), pollen sample
Image
![Field photographs of fossil-bearing lithofacies. (A) Overview of the Tufolitas Laguna del Hunco (Laguna del Hunco locality). (B) Laminated mudstone facies (Laguna del Hunco locality). (C) Photomicrograph of organic-rich laminated mudstone facies (Laguna del Hunco locality). (D) Gray ashy mudstone overlain by sediment gravity flow (resistant bed; Laguna del Hunco locality). (E) Photomicrograph showing microcrystalline nature of the gray ashy mudstone facies (Laguna del Hunco locality). (F) Leaf fossil preserved in gray ashy mudstone (Laguna del Hunco locality). (G) Volcaniclastic turbidite showing all five Bouma subdivisions (Laguna del Hunco locality). (H) Glass dome intruding gray ashy mudstone facies (Central Caldera locality). (I) Petrified tree trunk preserved in a clast-rich ash-flow tuff (Escuela Piedra Parada locality). (J) Root cast and cross-bedding in a crystal-rich reworked pyroclastic facies (Laguna Fría locality). (K) Field relationships among the Ignimbrita Barda Colorada, valley-filling volcaniclastic facies, orange ignimbrite, and Laguna Fría capping basalt (Laguna Fría locality). Fossil locality lies stratigraphically above the orange ignimbrite and below the basalt. (L) Oblique composite satellite image looking east at the area between the Laguna Fría and La Barda faunal localities (3× vertical exaggeration. Image used with permission; Image © 2019 Centre National d’Etudes Spatiales [CNES]/Airbus, © 2018 Google, Image © 2019 Maxar Technologies).](https://gsw.silverchair-cdn.com/gsw/Content_public/Journal/gsabulletin/133/3-4/10.1130_B35611.1/2/s_740f3a.png?Expires=2147483647&Signature=2Bl4bL08UdVBlVq4SHLcNlIwJgpaxKe02kQjKSbrGOcTZfJWol-VYHB2NPYQz1Vz6kZwtwv-ExFsKUK8jbPzovqjt6TCVOBCHzSGf8EMDHNzCQFpffXk6Y9viYE96WWaac-zLZO8vXaXNQgpOX6hUGWOH8lKGAteoqWNNWcozUFPdytWjNM-YFxQwCW5pPv9-FdZ3OVSZYoQAXgGW9fhIrwS50YR4dXx-mBQHrQdIkOdqkCwCbHNcRD-d6nIKmKWlpVvlUdmIvKSaRO4Mf3NKTrfNAUzFZb6agtMwz9DErZydSLd0SeHUcS~aMhDg-i~gXybetAS5s9syIiK3p~WVw__&Key-Pair-Id=APKAIE5G5CRDK6RD3PGA)
Field photographs of fossil-bearing lithofacies. (A) Overview of the Tufoli... Available to Purchase
in Facies interpretation and geochronology of diverse Eocene floras and faunas, northwest Chubut Province, Patagonia, Argentina
> GSA Bulletin
Published: 04 August 2020
Figure 3. Field photographs of fossil-bearing lithofacies. (A) Overview of the Tufolitas Laguna del Hunco (Laguna del Hunco locality). (B) Laminated mudstone facies (Laguna del Hunco locality). (C) Photomicrograph of organic-rich laminated mudstone facies (Laguna del Hunco locality). (D) Gray
Image
![Field photographs of fossil-bearing lithofacies. (A) Overview of the Tufolitas Laguna del Hunco (Laguna del Hunco locality). (B) Laminated mudstone facies (Laguna del Hunco locality). (C) Photomicrograph of organic-rich laminated mudstone facies (Laguna del Hunco locality). (D) Gray ashy mudstone overlain by sediment gravity flow (resistant bed; Laguna del Hunco locality). (E) Photomicrograph showing microcrystalline nature of the gray ashy mudstone facies (Laguna del Hunco locality). (F) Leaf fossil preserved in gray ashy mudstone (Laguna del Hunco locality). (G) Volcaniclastic turbidite showing all five Bouma subdivisions (Laguna del Hunco locality). (H) Glass dome intruding gray ashy mudstone facies (Central Caldera locality). (I) Petrified tree trunk preserved in a clast-rich ash-flow tuff (Escuela Piedra Parada locality). (J) Root cast and cross-bedding in a crystal-rich reworked pyroclastic facies (Laguna Fría locality). (K) Field relationships among the Ignimbrita Barda Colorada, valley-filling volcaniclastic facies, orange ignimbrite, and Laguna Fría capping basalt (Laguna Fría locality). Fossil locality lies stratigraphically above the orange ignimbrite and below the basalt. (L) Oblique composite satellite image looking east at the area between the Laguna Fría and La Barda faunal localities (3× vertical exaggeration. Image used with permission; Image © 2019 Centre National d’Etudes Spatiales [CNES]/Airbus, © 2018 Google, Image © 2019 Maxar Technologies).](https://gsw.silverchair-cdn.com/gsw/Content_public/Journal/gsabulletin/133/3-4/10.1130_B35611.1/2/s_740f3b.png?Expires=2147483647&Signature=EsAzlktaDaAWSAx-Q6tki74kAN5aE9ZSmg6kBm02~Fk-GT08J6aZhFD4gNevydKZh4MJfQJ5mUiFNsmVXSkhsE4~1MdtlsbxGXnwJVSMW5B7kNw-OiuW~PaAx6WoTaU800LZ7pXHBgVEjTqltsfmc6uAKKg1dF3cBO8Okgc0iGllpWQNmZXcz4pXgVWSmBp0rNjA47yDRqxA8luxX75EPtCNDfbblBr9H7sbzXru0D9aEAa105y-kcaceB~o2WoO3S0OEY4oSBqW2qcHVP9iGGQijruCSweBoHcDyuL~sQsjSMcSSU6c4-agkYKy9c4DeD~QQe1s3DWcOteiJzjJSw__&Key-Pair-Id=APKAIE5G5CRDK6RD3PGA)
Field photographs of fossil-bearing lithofacies. (A) Overview of the Tufoli... Available to Purchase
in Facies interpretation and geochronology of diverse Eocene floras and faunas, northwest Chubut Province, Patagonia, Argentina
> GSA Bulletin
Published: 04 August 2020
Figure 3. Field photographs of fossil-bearing lithofacies. (A) Overview of the Tufolitas Laguna del Hunco (Laguna del Hunco locality). (B) Laminated mudstone facies (Laguna del Hunco locality). (C) Photomicrograph of organic-rich laminated mudstone facies (Laguna del Hunco locality). (D) Gray
Journal Article
Facies interpretation and geochronology of diverse Eocene floras and faunas, northwest Chubut Province, Patagonia, Argentina Available to Purchase
Journal: GSA Bulletin
Publisher: Geological Society of America
Published: 04 August 2020
GSA Bulletin (2021) 133 (3-4): 740–752.
...Figure 3. Field photographs of fossil-bearing lithofacies. (A) Overview of the Tufolitas Laguna del Hunco (Laguna del Hunco locality). (B) Laminated mudstone facies (Laguna del Hunco locality). (C) Photomicrograph of organic-rich laminated mudstone facies (Laguna del Hunco locality). (D) Gray...
FIGURES
Journal Article
A PANORPOID (INSECTA: MECOPTERA) FROM THE LOWER EOCENE OF PATAGONIA, ARGENTINA Available to Purchase
Journal: Journal of Paleontology
Publisher: Paleontological Society
Published: 01 November 2009
Journal of Paleontology (2009) 83 (6): 994–997.
... and very few species in the entire Southern Hemisphere. The specimen is from the Tufolitas Laguna del Hunco (Laguna del Hunco Formation in Petrulevičius, 2001a ). Other insects found in the unit include Odonata, Blattodea, Orthoptera, Hemiptera, Coleoptera, caddis-cases of Trichoptera, Diptera...
FIGURES
Journal Article
Odonatan Endophytic Oviposition from the Eocene of Patagonia: The Ichnogenus Paleoovoidus and Implications for Behavioral Stasis Available to Purchase
Journal: Journal of Paleontology
Publisher: Paleontological Society
Published: 01 May 2009
Journal of Paleontology (2009) 83 (3): 431–447.
..., the Tufolitas Laguna del Hunco ( Aragón and Mazzoni, 1997 ; Aragón et al., 2001 ), and is located in western Chubut Province, Argentina, 160 km southeast from the Río Pichileufú (RP) locality, along the foothills of the Sierra de Huancache at S42.5, W70.0 degrees ( Fig. 1 ). The fossil material originates...
FIGURES
Image
Simplified geologic map of the study area, modified from Aragón and Mazzon... Available to Purchase
in Facies interpretation and geochronology of diverse Eocene floras and faunas, northwest Chubut Province, Patagonia, Argentina
> GSA Bulletin
Published: 04 August 2020
work and satellite imagery. Dashed lines represent inferred boundaries. The resurgent dome area has not yet been mapped in detail but contains pyroclastic deposits of the Tufolitas del Hunco; intracaldera volcanic flows and dikes; and capping Miocene to Pleistocene basalt flows.
