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| | UPPER CRETACEOUS-PALEOCENE ECHINOIDS FROM NORTHERN PATAGONIA, ARGENTINA Journal of Paleontology - Find Articles |
 | | The Cassiduloida are represented in the lower Danian by Nucleopygus Agassiz, 1840 and Pygopistes Pomel, 1883, while the Spatangoida, not strongly affected by Cretaceous-Paleogene boundary events, are represented by Diplodetus Schlüter, 1900, Hemiaster Agassiz in Agassiz and Desor, 1847, Paraster Pomel, 1869, and Proraster Arnaud in Grossouvre, 1901. |
 | | During the Maastrichtian-Danian interval, the southern tip of South America was reduced to an archipelago in which the emergent land was the central part of the Somuncurá and the Deseado massifs (Yrigoyen, 1969; Uliana and Biddle, 1988; Riccardi, 1988; Urien et al., 1995; Malumián, 1999). |
 | | Malumián and Caramés (1995) estimated the minimum area of presently emergent Patagonia that was covered by the sea during the Danian to have been 507,000 km^sup 2^. |
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