Chorrillo Formation
Stratigraphic range:
Satellite image of the Chorrillo Formation site (in the middle on the right). In the bottom left is the Perito Moreno Glacier.
TypeGeological formation
UnderliesCalafate Formation
OverliesLa Irene Formation
Thickness>50 m (160 ft)
Lithology
PrimaryClaystone
Location
LocationPatagonia
Coordinates49°54′S 72°30′W / 49.9°S 72.5°W / -49.9; -72.5
Approximate paleocoordinates51°48′S 62°12′W / 51.8°S 62.2°W / -51.8; -62.2
RegionSanta Cruz Province
CountryArgentina
ExtentSoutheast of Viedma Lake
North of Argentino Lake
Austral Basin
Type section
Named byArbe & Hechem
Year defined1984
Chorrillo Formation is located in Argentina
Chorrillo Formation
Chorrillo Formation (Argentina)
Dinosaurs named from the Chorrillo Formation

The Chorrillo Formation, also named as Chorillo Formation,[1] is a Maastrichtian (Late Cretaceous Epoch, 72.1 - 66 million years ago) geologic formation in southern Patagonia, Argentina. The formation is more than 50 metres (160 ft) thick and underlies the Calafate Formation and rests on top of the La Irene Formation.[2]

Fossils

Dinosaur remains are among the fossils that have been recovered from the formation.

Fossils recovered from the formation are:


Other fossils recovered from the formation are:

Gastropods
  • Plants
    • Podocarpoxylon dusenii
  • Pollen
    • Baculatisporites comaumensis
    • Baculatisporites kachaikensis
    • Ceratosporites equalis
    • Clavifera triplex
    • Clavatipollenites sp.
    • Concavissimisporites sp.
    • Cyatheacidites annulatus
    • Cyathidites australis
    • Cyathidites minor
    • Cyathidites rafaeli
    • Foveosporites canalis
    • Gleicheniidites senonicus
    • Laevigatosporites ovatus
    • Leptolepidites sp. cf. L. major
    • Microcachryidites antarcticus
    • Peninsulapollis gilli
    • Phyllocladidites mawsonii
    • Podocarpidites sp. cf. P. ellipticus
    • Podocarpidites sp. cf. P. herbstii
    • Podocarpidites sp.
    • Retitriletes austroclavatidites
    • Trichotomosulcites subgranulatus
    • Tricolpites reticulatus
    • Tricolpites sp.
    • Trilites fasolae
    • Trilites sp. cf. T. tuberculiformis
    • Trilites sp. cf. T parvallatus
    • Tuberculatosporites parvus
    • Vitreisporites signatus

See also

References

  1. Río Leona at Fossilworks.org
  2. Marenssi et al., 2003, p.406

Bibliography

Further reading

  • J. E. Powell. 2003. Revision of South American titanosaurid dinosaurs: palaeobiological, palaeobiogeographical and phylogenetic aspects. Records of the Queen Victoria Museum Launceston 111:1-173
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