Vereda Llanitos: Early/Lower Barremian - Late/Upper Aptian, Colombia

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Reptilia - Ophthalmosauridae
Muiscasaurus catheti n. gen., n. sp. Maxwell et al. 2015
1 specimen
Holotype specimen CIP-FCG-CBP-74. The skull is preserved in a calcareous concretion and is slightly laterally compressed. The anterior rostrum is bent to the right, suggesting a head-first arrival of the carcass on the sea floor. Some postcranial material (partial vertebral column and some ribs) is preserved in association with CIPFCG- CBP-74; the most anterior block of cervical vertebrae has been prepared. The preserved length of the lower jaw is 45 cm.
see common names

Geography
Country:Colombia State/province:Boyaca
Coordinates: 5.6° North, 73.5° West (view map)
Paleocoordinates:3.5° North, 42.2° West
Time
Period:Cretaceous Epoch:Early/Lower Cretaceous
Key time interval:Early/Lower Barremian - Late/Upper Aptian
Age range of interval:125.77000 - 113.00000 m.y. ago
Stratigraphy
Formation:Paja Member:Arcillolitas abigarradas
Stratigraphic resolution:group of beds
Stratigraphy comments: Two members of the Paja Formation are recognized, the Arcillolitas abigarradas (Barremian–Aptian; 480 m thick) and Arcillolitas con nodulos huecos (Aptian; 80 m thick; Fig. 1; Etayo-Serna 1968; Guerrero 2002a, b). Macrofossils are for the most part preserved in calcareous concretions; the part of this formation richest in fossil vertebrates appears to be the Barremian–Aptian aged Arcillolitas abigarradas Member (Etayo-Serna 1968). The Arcillolitas abigarradas forms extensive natural outcrops in the area around Villa de Leyva (Fig. 1). Ammonites are exceptionally abundant and three-dimensionally preserved in this region. Thus, relative age is constrained primarily by ammonite biostratigraphy, relying heavily on the zonation scheme proposed by Etayo-Serna (1968) and refined by subsequent authors (Patarroyo 2000; Hoedemaeker 2004). Correlation between Colombian (Caribbean Subprovince, Tethyan Realm) and European (Mediterranean Subprovince, Tethyan Realm) ammonite zones has been attempted based on genera and even species shared between the two regions (Patarroyo 2000; Hoedemaeker 2004; Kakabadze et al. 2004). These include species of Nicklesia, Pulchellia, Heinzia, Pseudohaploceras, Colchidites, Cheloniceras, Acanthohopclites, Colombiceras and Dufrenoyia, among others (Etayo-Serna 1968; Patarroyo 2000; Hoedemaeker 2004; Kakabadze et al. 2004).
Lithology and environment
Primary lithology:nodular lithified "shale"
Secondary lithology: lithified "limestone"
Environment:marine indet. Tectonic setting:back-arc basin
Geology comments: The Paja Formation consists of intercalated black shales and limestones of Early Cretaceous age (Hauterivian– Aptian) deposited in a quiet back-arc basin (Hoedemaeker 2004; Campos-Alvarez and Roser 2007). Environmental interpretations range from intertidal (Forero-Onofre and Sarmiento-Rojas 1985; Hoedemaeker 2004), to shallow marine inner to middle shelf (Guerrero 2002a; Caceres et al. 2003; Campos-Alvarez and Roser 2007). The latter interpretation is more consistent with the abundant wellpreserved vertebrate fossils and black shale deposition.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Temporal resolution:snapshot
Collection methods and comments
Reason for describing collection:general faunal/floral analysis
Metadata
Database number:175725
Authorizer:V. Fischer Enterer:V. Fischer
Research group:vertebrate
Created:2016-01-05 13:32:49 Last modified:2016-01-05 13:32:49
Access level:the public Released:2016-01-05 13:32:49
Creative Commons license:CC BY
Reference information

Primary reference:
57534. E. E. Maxwell, D. Dick, S. Padilla and M. L. Parra. 2015. A new ophthalmosaurid ichthyosaur from the Early Cretaceous of Colombia. Papers in Palaeontology [V. Fischer/V. Fischer]