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Author - title
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Year
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| details | Early Aptian | Antarctica | Riding,J.B. et al. The age of the Base of the Gustav Group in the James Ross Basin Antarctica | 1998 | |
| details | Early Aptian | Antarctica | Hathway,B. et al. 40Ar/39Ar geochronology and palynology of the Cerro Negro Formation, South Shetland Islands, Antarctica: A new radiometric tie for Cretaceous terrestrial biostratigraphy in the Southern Hemisphere. | 1999 |