Where: Chubut, Argentina (42.7° S, 69.9° W)
• Paleocoordinates: 44.2° S, 59.5° W (Wright 2013)
• coordinate stated in text
• outcrop-level geographic resolution
When: Lutetian (47.8 - 41.3 Ma)
• Proposed "Sapoan" South American Land Mammal Age (Tejedor et al. 2009)
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•Gosses et al. (2020) Conclusions: The Laguna Fría fauna is younger, constrained between the 49.26 ± 0.30 Ma Laguna Fría orange ignimbrite and the 43.50 ± 1.14 Ma Laguna Fría capping basalt. The age of the nearby La Barda fauna is more difficult to confidently determine. If previous stratigraphic relations inferred by Tejedor et al. (2009) are correct, then the La Barda fauna is at least 2 m.y. younger than its previously assumed age range of 47–45 Ma. The detailed stratigraphy of basaltic eruptions is poorly known however, and it is therefore possible that the La Barda and Laguna Fría faunas are similar in age. Finally, the Laguna Fría age range overlaps with the age ranges proposed by Krause et al. (2017) for the Riochican and Vacan faunas and therefore does not directly support the existence of a temporally distinct “Sapoan” SALMA.
• bed-level stratigraphic resolution
Environment/lithology: terrestrial; tuff
Size classes: macrofossils, mesofossils
Primary reference: M. F. Tejedor, F. J. Goin, J. N. Gelfo, G. López, M. Bond, A. A. Carlini, G. J. Scillato-Yané, M. O. Woodburne, L. Chornogubsky, E. Aragón, M. A. Reguero, N. J. Czaplewski, S. Vincon, G. M. Martin, and M. R. Ciancio. 2009. New Early Eocene mammalian fauna from western Patagonia, Argentina. American Museum Novitates 3638:1-43 [J. Zijlstra/J. Zijlstra]more details
Purpose of describing collection: general faunal/floral analysis
PaleoDB collection 176059: authorized by Jelle Zijlstra, entered by Jelle Zijlstra on 23.01.2016, edited by Evangelos Vlachos, Miranta Kouvari and Kateryn Pino
Creative Commons license: CC0 (CC0)
Taxonomic list
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? Amilnedwardsiidae "gen. et sp. indet. H" two left mandibular fragments from Laguna Fr ́ıa, one with p2 and p3 par- tially broken, and p4–m2 (LIEB-PV 1616), and a second specimen with p3–4 (LIEB-PV 1617)
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| Mammalia | |
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Microbiotheriidae "Gen. et sp. indet. D" Ameghino 1887 marsupial LIEB-PV 1039, a fragment of right dentary with the alveoli for i1-m2, and LIEB-PV 1041, a right Mx.
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Didelphimorphia "Gen. et sp. indet. A" Gill 1872 marsupial Three upper molars including LIEB-PV 1042
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Pauladelphys sp. Goin et al. 1999 marsupial dentition, maxillae, and man- dibles mostly from Laguna Fría
Derorhynchus sp. Couto 1952 marsupial two specimens (LIEB- PV 1102, right m4; LIEB-PV 1140, isolated left talonid)
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Protodidelphis "cf. sp. nov." Paula Couto 1952 marsupial About a dozen isolated upper and lower teeth
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Peradectidae "Gen. et sp. nov. 1", "Caroloameghiniidae "Gen. et sp. nov. 2"" = Caroloameghiniinae
Peradectidae "Gen. et sp. nov. 1" marsupial One upper and three lower molars from Laguna Fr ́ıa are referred to this new taxon (LIEB-PV 1031, a left M?3).
"Caroloameghiniidae "Gen. et sp. nov. 2"" = Caroloameghiniinae Ameghino 1901 marsupial Three lower molars collected at Laguna Fría
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Hypodolops sapoensis n. gen. n. sp.1, Hypodolops sapoensis1, Amphidolops "sp. nov. 2", Amphidolops intermedius1, Amphidolops minimus n. sp.1, "Polydolops rothi" = Pliodolops rothi, Polydolops unicus
Hypodolops sapoensis n. gen. n. sp.1 Chornogubsky 2020 metatherian Not clear which material comes from Laguna Fría and which from La Barda. "LIEB-PV 1153, a maxillary fragment with M1–2, as well as four lower molars are included in this new species recovered in La Barda and Laguna Fría"
Hypodolops sapoensis1 Chornogubsky 2020 metatherian Not clear which material comes from Laguna Fría and which from La Barda. "LIEB-PV 1173, a right maxillary fragment with M1–2, as well as several maxillary and mandibular remains and isolated teeth have been assigned to this new taxon collected in both localities of Paso del Sapo."
Amphidolops "sp. nov. 2" Ameghino 1902 metatherian Not clear which material comes from Laguna Fría and which from La Barda. "LIEB-PV 1187, a right m2, and several isolated lower and upper molars from both localities of Paso del Sapo"
Amphidolops intermedius1 Chornogubsky 2020 metatherian LIEB-PV 1179, LIEB-PV 1180, LIEB-PV 1189 and LIEB-PV 1190
Amphidolops minimus n. sp.1 Chornogubsky 2020 metatherian LIEB-PV 1173, a right maxillary fragment with M1–2, as well as several maxillary and mandibular remains and isolated teeth have been assigned to this new taxon collected in both localities of Paso del Sapo.
Polydolops unicus Tejedor et al. 2009 metatherian LIEB-PV 1240*, left maxillary fragment with M2–3; LIEB-PV 1241*, left M1, LIEB-PV 1242*, right M1, LIEB-PV 1243*, right M1, LIEB-PV 1244*, right, broken M1; LIEB-PV 1212*, left dentary with broken m1, complete m2, and roots of m3; LIEB-PV 1217*, right dentary with m1–3; LIEB-PV 1259*, left mandible with m1–2 and roots of p3; LIEB- PV 1260*, left mandible with m2–3; LIEB- PV 1261*, left m2; LIEB-PV 1262*, right mandible with m1–2;
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"Hathliacynidae "Gen. et sp. nov. 6"" = Hathlyacininae
"Hathliacynidae "Gen. et sp. nov. 6"" = Hathlyacininae Ameghino 1894 metatherian LIEB-PV 1036, a maxillary fragment with M?3 (fig. 3H), and LIEB-PV 1037, isolated metastylar portion of a right M?2,
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cf. Itaboraidelphys sp. Marshall and de Muizon 1984 metatherian illustrated is an isolated right m2 or m3 (LIEB-PV 1064), and addi- tional referred materials include an isolated left metastylar area (M1 or M2; LIEB-PV 1066); isolated lower left premolar (LIEB-PV 1067); fragment of left upper molar (Mx; LIEB-PV 1110); and right metastylar fragment (LIEB-PV 1075).
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Riostegotherium sp. Oliveira and Bergqvist 1998 armadillo Several isolated plates of the dorsal carapace
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Chiroptera "gen. et sp. nov. 9"4 Blumenbach 1779 bat well preserved left m?2 (LIEB-PV 999; Fig. 2a, b, c) and a right talonid (LIEB-PV 1000; Fig. 2d)
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Teratopithecus elpidophoros n. gen. n. sp.2 López et al. 2020 notoungulate LIEB-PV 1627, partial right maxilla with P3- M2
Archaeopithecus cf. rogeri Ameghino 1897 notoungulate Not clear which material comes from Laguna Fría and which from La Barda. "Several maxillary and mandibular fragments (e.g., LIEB-PV 1625 to 1628), as well as isolated teeth (e.g., LIEB-PV 1629) referred to this family have been found in La Barda and Laguna Fría."
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Isotemnus sp. Ameghino 1897 notoungulate LIEB-PV 1646, right maxilla with P4–M3, LIEB-PV 1659, left m2
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Othnielmarshia lacunifera Ameghino 1901 notoungulate right maxillary fragment with complete M1–3 (LIEB-PV 1618, fig. 7F)
Henricosbornia lophodonta Ameghino 1901 notoungulate Maxillary and mandibular fragments re- ferred to the Family Henricosborniidae are abundant in both localities of Paso del Sapo
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Notostylops sp. Ameghino 1897 notoungulate Mandibular fragments and isolated upper teeth that can be referred to the genus Notostylops are abundant in both localities of Paso del Sapo.
Edvardotrouessartia sola Ameghino 1901 notoungulate Two maxillary fragments were collected at Laguna Fr ́ıa, one with broken P2–4 (LIEB-PV 1619; fig. 7G), and the other with incomplete P4 (LIEB-PV 1620)
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"Notopithecinae "gen. et sp. indet. J"" = Notopithecidae
"Notopithecinae "gen. et sp. indet. J"" = Notopithecidae Ameghino 1897 notoungulate A few isolated teeth, including LIEB-PV 1655, left lower p3
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? Astrapotheria "gen. et sp. indet. L" Lydekker 1894 placental right maxillary fragment with part of the hypertrophied and compressed canine that may be attributable to the Astrapotheria (LIEB-PV 1624),
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Sparnotheriodontidae "gen. et sp. indet. G" Soria 1980 placental right maxillary fragment (MLP 66-V-12-2; fig. 7D) with three molariforms (P4–M2?), right M3 (MLP 66-V- 12-1), and a broken left M1 or M2 (LIEB-PV 1615).
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Didolodontidae "gen. et sp. nov. 8" Simpson 1934 placental right partial mandible with part of the talonid of m2 and complete m3 (LIEB-PV 1612)
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