Guillermo Davilo: Campanian - Maastrichtian, Peru
collected by geologists working for the Socony Vacuum Oil Company in Peru
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
|
Reptilia
- Mosasauridae
|
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|
Halisaurus sp.
Marsh 1869
|
1 individual | |||||||||
| MCZ 2607 | ||||||||||
| see common names | ||||||||||
Geography
| Country: | Peru |
| Coordinates: | 10.0° South, 74.9° West (view map) |
| Paleocoordinates: | 12.3° South, 57.4° West |
| Basis of coordinate: | stated in text |
| Geographic resolution: | small collection |
Time
| Period: | Cretaceous | Epoch: | Late/Upper Cretaceous |
| Key time interval: | Campanian - Maastrichtian | ||
| Age range of interval: | 83.60000 - 66.00000 m.y. ago |
Stratigraphy
| Formation: | Vivian |
| Stratigraphic resolution: | bed |
Lithology and environment
| Primary lithology: | massive,fine,coarse,brown,yellow lithified sandstone |
| Secondary lithology: | massive,"cross stratification",coarse lithified sandstone |
| Lithology description: "Kummel (1948) describes the Vivian Formation as containing two distinct lithofacies. The upper member is 80 m thick, and is comprised of yellowish-brown to white, massive, coarse to fine-grained sandstones with black partings, and interbedded black silty shale beds some of which are two meters thick. The lower member is 140 m thick, and is composed of massive, coarse, cross-bedded sandstones, with interbedded black shale beds, and prominent ironstone concretions. Lateral lithofacies changes, from sandstones to black shales, occur east to west. Vivian outcrops strike north-south, parallel to the north-south axes of regional eastern Andean ant- and synclinal fold belts." It is not known in which facies the fossils were found. | |
| Environment: | deltaic indet. |
| Geology comments: "Could be either a fluvially influenced estuary or prograding delta front." | |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
| Spatial orientation: | random |
| Preservation of anatomical detail: | good |
| Abundance in sediment: | rare |
| Fragmentation: | occasional |
| Spatial resolution: | parautochthonous |
Collection methods and comments
| Collection size: | 1 individuals |
| Reason for describing collection: | general faunal/floral analysis |
| Museum repositories: | MCZ |
| Collectors: | geologists working for the Socony Vacuum Oil Company in Peru |
Metadata
| Also known as: | Rio Pachitea | ||
| Database number: | 98018 | ||
| Authorizer: | M. Carrano | Enterer: | H. Street |
| Modifier: | P. Mannion | Research group: | vertebrate |
| Created: | 2010-09-16 13:41:38 | Last modified: | 2023-08-01 10:16:48 |
| Access level: | the public | Released: | 2010-09-16 13:41:38 |
| Creative Commons license: | CC BY | ||
Reference information
Primary reference:
| 33896. | M. W. Caldwell and G. L. Bell, Jr. 1995. Halisaurus sp. (Mosasauridae) from the Upper Cretaceous (Santonian) of east-central Peru, and the taxonomic utility of mosasaur cervical vertebrae. Journal of Vertebrate Paleontology 15(3):532-544 [M. Carrano/H. Street] |