Description
Conglomerate and sandstone exposed on southern Powell Island, deposited as debris flows and braided stream deposits in alluvial fans within terrestrial to marine fault-bounded basins. Boulders resembling Greywacke Shale Formation (1) suggest a local derivation from the north and east. Youngest braided stream deposits at Johns Peaks contain Middle Jurassic flora.
Age
Middle Jurassic
Map Reference
Flowerdew, M. J. & Haselwimmer, C. E. Geological Map of the South Orkney Islands (1:150 000 scale). Sheet 2, (British Antarctic Survey, 2011). Available here.