Lopez de Bertodano Formation
| 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 |
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) to the Danian stage of the lower Paleocene, from about 70 to 65.5 million years ago, straddling the Cretaceous-Paleogene boundary.