The first record of Cooksonia

Plant megafossils resembling Cooksonia caledonica Lang aredescribed from the Kirusillas Formation in southern Bolivia.Faunal and lithological evidence together with field relation-ships advocate a late Silurian (Ludlow) age. Palaeocontinentalreconstructions suggest that the plants grew on the western edgeof Gondwana at 50–60° S and indicate that Cooksonia hadspread to higher latitudes soon after its appearance in the Wenlock