Also known as Los Alamitos vertebrates, middle section - green-coloured bed (mammals), Cerro Cuadrado, Arroyo Verde
Where: Río Negro, Argentina (42.1° S, 66.3° W: paleocoordinates 45.0° S, 52.3° W)
• coordinate estimated from map
• outcrop-level geographic resolution
When: Los Alamitos Formation, Late/Upper Campanian to Late/Upper Campanian (83.5 - 66.0 Ma)
• middle section of formation includes vertebrate fossils distributed over about 30 meters of section
•Mammals: Middle section of Los Alamitos Formation - green-coloured bed just below the concretionary top of the Cerrito del Mamifero, Alamitian provincial age (Campanian sensu lato)
• group of beds-level stratigraphic resolution
Environment/lithology: lacustrine - large; bioturbated, concretionary, yellow siltstone and bioturbated, intraclastic sandstone
•The paleoenvironment according to Andreis (1987; and personnal communication) is that of a lacustrine environment mixed with shallow marine sediments, as indicated by the presnce of glauconite in some levels of the sequence.
Size classes: macrofossils, mesofossils
Preservation: trace
Collected by J. F. Bonaparte, J. E. Powell in 1982-1983
Collection methods: quarrying, surface (float), surface (in situ), mechanical,
Primary reference: J. F. Bonaparte. 1984. Nuevas pruebas de la conexion fisica entre Sudamerica y Norteamerica en el Cretácico Tardio (Campaniano) [New evidences for the physical connection between South and North America in the Late Cretaceous (Campanian)]. Actas del III Congreso Argentino de Paleontologia y Bioestratigrafia 1:141-149 [M. Carrano/M. Carrano/M. Carrano]more details
Purpose of describing collection: general faunal/floral analysis
PaleoDB collection 45087: authorized by Matthew Carrano, entered by Matthew Carrano on 04.10.2004, edited by Franco Aspromonte, Philip Mannion, Roger Benson, Jonathan Tennant and Evangelos Vlachos
Creative Commons license: CC BY (attribution)
Taxonomic list
Chondrichthyes | |
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Mammalia | |
Ferugliotherium sp.17 Bonaparte 1986 mammal MACN-RN 249 (anterior upper premolar), and framgnetary left dentary
Ferugliotherium windhauseni n. gen. n. sp.7 Bonaparte 1986 mammal MACN-RN 20 (holotype worn right m2) and specimen referred by Krause et al 1992: MACN-RN 701A, B (partial left i1s), 701C (partial i1), 253 (partial left m1), 702A–D (partial I2s), 248-251, MACN-RN 975; incisors and premolars only tentatively referred
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Gondwanatherium patagonicum n. gen. n. sp.6
Gondwanatherium patagonicum n. gen. n. sp.6 Bonaparte 1986 mammal MACN-RN 22 (holotype) 22-26, 228, 703-705, 970, 1024-1031
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Mesungulatidae indet.15 Bonaparte 1986 mammal MACN-RN 239, complete left P1; MACN-RN 240, complete left p1, MACN-RN 1135-1137
Mesungulatum houssayi n. gen. n. sp.8 Bonaparte and Soria 1985 mammal MACN-RN 1, 3-12, 141, 181-184, 244
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Austrotriconodon mckennai n. gen. n. sp.7
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Paraungulatum rectangularis n. gen. n. sp.9
Paraungulatum rectangularis n. gen. n. sp.9 Bonaparte 2002 mammal MACN-RN 180 (left upper molar), 1141
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Groebertherium indet.20, Groebertherium stipanicici n. gen. n. sp.7, Groebertherium novasi n. gen. n. sp.7
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Reptilia | |
"Madtsoiinae indet." = Madtsoiidae20, Alamitophis argentinus n. gen. n. sp.3, Patagoniophis parvus n. gen. n. sp.3, Rionegrophis madtsoioides n. gen. n. sp.3
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Palaeophrynops patagonicus n. gen. n. sp.18
Palaeophrynops patagonicus n. gen. n. sp.18 Lapparent de Broin and de la Fuente 2001 sideneck turtle | |
Chelidae "indet. D"14 Gray 1825 sideneck turtle The abundance is estimated, should be checked. MACN-RN 43-64, 77-100, 102-140
cf. Yaminuechelys sp.19 de la Fuente et al. 2001 sideneck turtle The abundance is estimated, should be checked. MACN-RN 43-64, 77-100, 102-140
aff. Emydura sp.19 Bonaparte 1836 sideneck turtle The abundance is estimated, should be checked. MACN-RN 43-64, 77-100, 102-140
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Ornithothoraces indet.11, Ornithurae indet.2, cf. Hesperornithiformes indet.2, Alamitornis minutus n. gen. n. sp.2
Ornithurae indet.2 avialan MACN PV RN 1111 (distal end of left tibiotarsus, without distal condyles), MACN PV RN 1112 (distal end of left tibiotarsus with damaged medial condyle) and MACN PV RN 1113 (distal end of left tibiotarsus with complete distal condyles)
Alamitornis minutus n. gen. n. sp.2 Agnolin and Martinelli 2009 avialan MACN PV RN 1108 - holotype (proximal third of a left humerus) and referred material: MACN PV RN 1109 (five proximal extremes of right humeri of different individuals) and MACN PV RN 1110 (distal half of a left femur of a juvenile specimen)
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Aves | |
Aves indet.2 bird MACN PV RN 1103 (distal end of indeterminate pedal phalanx), MACN PV RN 1104 (distal end of pedal phalanx, probably II-2), MACN PV RN 1105 (pedal ungual of digit I) and MACN PV RN 1106 (manual ungual of digit I); MACN PV RN 1107 (pedal phalanx 1 of right digit II without its proximal end)
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cf. Neornithes indet.2 bird MACN PV RN 1115 (distal end of right tarsometatarsus without metatarsal IV and distal trochlea of metatarsal II)
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Reptilia | |
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"Kritosaurus australis n. sp." = Huallasaurus australis10
"Kritosaurus australis n. sp." = Huallasaurus australis10 Bonaparte et al. 1984 hadrosaurine MACN-RN 142-146, 826, 977-995, 997-998
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Amphibia | |
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Osteichthyes | |
Atlantoceratodus patagonicus1, "Ceratodus iheringi" = Atlantoceratodus iheringi12, Metaceratodus wichmanni n. sp.13
"Ceratodus iheringi" = Atlantoceratodus iheringi12 Ameghino 1906 lungfish MACN-RN 157-158, dental plates
Metaceratodus wichmanni n. sp.13 Apesteguía and Agnolin 2007 lungfish MACN PV RN157A, left upper tooth plate
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Ptychoceratodus cionei n. sp.5
Ptychoceratodus cionei n. sp.5 Apesteguia et al. 2007 lungfish MACN PV RN157A and 157B, two lower tooth plates
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Actinopteri | |
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cf. Diplomystidae indet.12 Eigenman 1890 catfish MACN-RN 152, eight proximal fragments, eight central fragments and one pectoral spine
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Lepisosteidae indet.12 Cuvier 1825 gar MACN-RN 150, 156, six vertebrae, skulls fragments and 200 dermal scales
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