Eastern slopes of the La Colonia area: Maastrichtian, Argentina

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Reptilia - Serpentes
Serpentes indet. Linnaeus 1758
1 specimen
MPEF-PV 642, trunk vertebra
Reptilia - Madtsoiidae
Alamitophis argentinus Albino 1986
1 specimen
MPEF-PV 643, trunk vertebra
? Madtsoiidae indet. (Hoffstetter 1961)
3 specimens
MPEF-PV 641, MPEFPV 644 and MPEF-PV 645, incomplete vertebrae
    = Eomadtsoia ragei Gómez et al. 2019
Gómez et al. 2019
? Boidae indet. Gray 1825
4 specimens
MPEF-PV 646, MPEFPV 647, MPEF-PV 648 and MPEF-PV 649, incomplete vertebrae
    = Eomadtsoia ragei Gómez et al. 2019
Gómez et al. 2019
Reptilia - Plesiosauria - Elasmosauridae
Elasmosauridae indet. Cope 1869
Gasparini et al. 2001 2 elements
MPEF s/n, isolated and incomplete cervical and dorsal vertebrae
see common names

Geography
Country:Argentina State/province:Chubut
Coordinates: 42.9° South, 67.5° West (view map)
Paleocoordinates:45.2° South, 55.9° West
Basis of coordinate:stated in text
Time
Period:Cretaceous Epoch:Late/Upper Cretaceous
Stage:Maastrichtian 10 m.y. bin:Cretaceous 8
*Period:Late/Upper Cretaceous - Late/Upper Cretaceous *Epoch:Campanian-Maastrichtian (minimum)
Key time interval:Maastrichtian
Age range of interval:72.10000 - 66.00000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:La Colonia
Stratigraphic resolution:bed
Stratigraphy comments: Fossil localities described from "second facies association of the La Colonia Formation.." (Albino, 2000:248). No further stratigraphic data provided.

La Colonia Fm = Maastrichtian (Clyde et al. 2021)
Lithology and environment
Primary lithology: not reported
Environment:estuary/bay
Geology comments: Depositional environment described as "...estuary, tidal flat, or coastal plain environment, influenced both by occasional high fresh water stream flow from the continent and tidal occurrences from the sea..." (Albino, 2000:249).
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Preservation of anatomical detail:poor
Articulated whole bodies:none
Disassociated major elements:all
Fragmentation:frequent
Bioerosion:none
Encrustation:none
Collection methods and comments
Collection excludes:some macrofossils,some microfossils
Collection methods:field collection,survey of museum collection,observed (not collected)
Collection size:9 specimens
Reason for describing collection:general faunal/floral analysis
Museum repositories:MEF
Taxonomic list comments:Additional taxa listed from second facies include: fishes, turtles, crocodiles, plesiosaurs, dinosaurs, mammals. No additional information is provided.
Metadata
Database number:26749
Authorizer:J. Head, P. Mannion, E. Vlachos Enterer:J. Head, F. Aspromonte, J. Tennant
Modifier:F. Aspromonte Research group:vertebrate
Collections that are a subset of this one:36447
Created:2002-10-27 14:45:08 Last modified:2024-01-11 08:43:43
Access level:the public Released:2002-10-27 14:45:08
Creative Commons license:CC BY
Reference information

Primary reference:

7376. A. M. Albino. 2000. New record of snakes from the Cretaceous of Patagonia (Argentina). Geodiversitas 22(2):247-253 [J. Head/J. Head/P. Mannion]

Secondary references:

49730 L. C. Gaetano, C. A. Marsicano, and G. W. Roughier. 2013. A revision of the putative Late Cretaceous triconodonts from South America. Cretaceous Research 46:90-100 [P. Mannion/J. Tennant]
46158 Z. Gasparini, S. Casadio, M. Fernandez and L. Salgado. 2001. Marine reptiles from the Late Cretaceous of northern Patagonia. Journal of South American Earth Sciences 14(1):51-60 [P. Mannion/J. Tennant/F. Aspromonte]
71150 R. O. Gómez, F. F. Garberoglio, and G. W. Rougier. 2019. A new Late Cretaceous snake from Patagonia: Phylogeny and trends in body size evolution of madtsoiid snakes. Comptes Rendus Palevol 18(7):771-781 [P. Mannion/P. Mannion/F. Aspromonte]