Cerro la Isla: Berriasian, Chile
collected by Larry Marshall, Michael Bell, Patricia Salinas and Manuel Suárez 1988
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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unclassified
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Pterosauria indet.
(Kaup 1834)
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Bell and Padian 1995 | |||||||||
| Fragmentary remains of thousands of individuals | ||||||||||
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= ? Gnathosaurinae indet.
Unwin 1992
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Martill et al. 2006 | |||||||||
| Specimens include: SMNK-PAL 4012-4015 | ||||||||||
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= Ctenochasmatidae indet.
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Alarcón-Muñoz et al. 2020 | |||||||||
| SGO.PV.350, 351, 362, 364, 377 and 378; SMNK-PAL 4012-4015 | ||||||||||
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Osteichthyes
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Osteichthyes indet.
Huxley 1880
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| scales | ||||||||||
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Reptilia
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Crocodyliformes indet.
Hay 1930
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= Mesoeucrocodylia indet.
Whetstone and Whybrow 1983
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Bajor et al. 2022 | |||||||||
| SGO.PV.1160 - tooth | ||||||||||
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Dinosauria indet.
(Owen 1842)
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Bell and Padian 1995 | |||||||||
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Reptilia
- Iguanodontidae
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Iguanodontidae indet.
Bonaparte 1850
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1 specimen | |||||||||
| caudal vertebra | ||||||||||
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Reptilia
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Sauropoda indet.
(Marsh 1878)
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1 specimen | |||||||||
| partial ulna or fibula | ||||||||||
| see common names | ||||||||||
Geography
| Country: | Chile | State/province: | Atacama |
| Coordinates: | 27.4° South, 69.5° West (view map) | ||
| Paleocoordinates: | 26.2° South, 34.0° West | ||
| Basis of coordinate: | estimated from map | ||
| Geographic resolution: | local area |
Time
| Period: | Cretaceous | Epoch: | Early/Lower Cretaceous |
| Stage: | Berriasian | 10 m.y. bin: | Cretaceous 1 |
| Key time interval: | Berriasian | ||
| Age range of interval: | 145.00000 - 139.80000 m.y. ago |
Stratigraphy
| Formation: | Quebrada Monardes | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: Probably Berriasian based on Martínez et al. (2015 [see Alarcón-Muñoz et al. 2020]) | |||||
Lithology and environment
| Primary lithology: | "cross stratification" conglomeratic sandstone | ||
| Secondary lithology: | planar lamination mudstone | ||
| Includes fossils? | Y | ||
| Lithology description: "The pterosaur horizon fines upward from cross-bedded pebbly sandstone and intraclast breccia at the base to parallel-bedded mudstone at the top. The base is an irregular erosion surface cut 50 cm or more into the underlying sediments. There is no distinctive basal lag gravel" | |||
| Environment: | "floodplain" | Tectonic setting: | intermontane basin |
| Geology comments: "Intra-arc extensional basin. The fault-bounded basin formed a deep, but narrow, north-south elongated trough within an andesitic volcanic chain. Warm and arid climate with a low and seasonal rainfall. Intermontane desert basin flanked by volcanoes and floored by dune fields, saline lakes, mudflats, alluvial fans and floodplains. The pterosaur horizon is interpreted as the traction and debris-flow deposits of a rapidly flowing sheet of water. Represents an exceptional flood event" | |||
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
| Spatial orientation: | random |
| Preservation of anatomical detail: | poor |
| Abundance in sediment: | few |
| Disassociated major elements: | some |
| Disassociated minor elements: | many |
| Fragmentation: | extreme |
| Spatial resolution: | allochthonous |
Collection methods and comments
| Collection methods: | field collection,survey of museum collection | ||
| Reason for describing collection: | paleoecologic analysis | ||
| Collectors: | Larry Marshall, Michael Bell, Patricia Salinas and Manuel Suárez | Collection dates: | 1988 |
Metadata
| Database number: | 92314 | ||
| Authorizer: | R. Butler, P. Mannion, M. Carrano | Enterer: | R. Butler, M. Carrano, P. Mannion |
| Modifier: | G. Varnham | Research group: | vertebrate |
| Created: | 2009-11-06 00:13:45 | Last modified: | 2022-02-09 06:23:48 |
| Access level: | the public | Released: | 2009-11-06 00:13:45 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 43560. | C. M. Bell and M. Suarez. 1989. Vertebrate fossils and trace fossils in Upper Jurassic-Lower Cretaceous red beds in the Atacama region, Chile. Journal of South American Earth Sciences 2(4):351-357 [P. Mannion/J. Tennant/J. Tennant] |
Secondary references:
| 71500 | J. Alarcón-Muñoz, S. Soto-Acuña, L. Codorniú, D. Rubilar-Rogers, M. Sallaberry and M. Suárez. 2020. New ctenochasmatid pterosaur record for Gondwana: discovery in the Lower Cretaceous continental deposits of the Atacama Desert, northern Chile. Cretaceous Research 110:104378 [P. Mannion/P. Mannion/P. Mannion] | |
| 84564 | D. Bajor, J. Alarcón-Muñoz, A. Lizama-Catalán and D. Rubilar-Rogers. 2022. An isolated mesoeucrocodylian tooth crown from the Lower Cretaceous Cerro La Isla pterosaur site in the Atacama Region, northern Chile. Boletín del Museo Nacional de Historia Natural, Chile 71(2):5-22 [P. Mannion/P. Mannion] | |
| 31118 | C. M. Bell and K. Padian. 1995. Pterosaur fossils from the Cretaceous of Chile: evidence for a pterosaur colony on an inland desert plain. Geological Magazine 132:31-38 [R. Butler/R. Butler] | |
| 31119 | D. M. Martill, E. Frey, C. M. Bell and G. C. Diaz. 2006. Ctenochasmatid pterosaurs from Early Cretaceous deposits in Chile. Cretaceous Research 27:603-610 [R. Butler/R. Butler] | |
| 76537 | D. Rubilar-Rogers and A. O. Vargas. 2008. Vertebrados terrestres del Mesozoico en Chile: estado del conocimiento y perspectivas [Mesozoic terrestrial vertebrates in Chile: state of knowledge and perspectives]. In A. Rubilar R., D. Rubilar-R., & C. S. Gutstein (eds.), I Simposio—Paleontología en Chile. Libro de Actas 83-86 [M. Carrano/M. Carrano] | |
| 55605 | P. Salinas, L. G. Marshall, and P. Sepúlveda. 1991. Vertebrados continentales del Paleozoico y Mesozoico de Chile [Continental vertebrates of the Paleozoic and Mesozoic of Chile]. Actas del VI Congreso Geológicao Chileno, Viña del Mar 310-313 [M. Carrano/M. Carrano] |