| Lopez de Bertodano Formation | |
|---|---|
| Stratigraphic range: Maastrichtian-Danian ~ | |
| Type | Geological formation |
| Unit of | Marambio & Seymour Island Groups |
| Sub-units | Cape Lamb & Lower Sandwich Bluff Members |
| Underlies | Sobral Fm., La Meseta Fm. |
| Overlies | Snow Hill Island Formation |
| Lithology | |
| Primary | Siltstone, mudstone |
| Other | Sandstone with concretions |
| Location | |
| Coordinates | 64°00′S 57°24′W / 64.0°S 57.4°W |
| Approximate paleocoordinates | 61°54′S 68°06′W / 61.9°S 68.1°W |
| Region | Seymour Island, James Ross Island group, Vega Island |
| Country | Antarctica |
| Type section | |
| Named for | López de Bertodano Bay |
  Lopez de Bertodano Formation (Antarctica) | |
The Lopez de Bertodano Formation is a geological formation in the James Ross archipelago of the Antarctic Peninsula. The strata date from the end of the Late Cretaceous (upper-lower Maastrichtian stage[1]) to the Danian stage of the lower Paleocene, from about 70 to 65.5 million years ago, straddling the Cretaceous-Paleogene boundary.[2]
- ^ Olivero, E.B.; Ponce, J.J.; Marsicano, C.A.; Martinioni, D.R. (2007). "Depositional settings of the basal Lopez de Bertodano Formation, Maastrichtian, Antarctica". Revista de la Asociación Geológica Argentina. 62 (4): 521–529.
- ^ Bowman, V.; Ineson, J.; Riding, J.; Crame, J.; Francis, J.; Condon, D.; Whittle, R.; Ferraccioli, F. (2016). "The Paleocene of Antarctica: Dinoflagellate cyst biostratigraphy, chronostratigraphy and implications for the palaeo-Pacific margin of Gondwana". Gondwana Research. 38: 132–148. Bibcode:2016GondR..38..132B. doi:10.1016/j.gr.2015.10.018.