Robuta

https://www.bas.ac.uk/data/our-data/publication/evidence-for-pre-jurassic-subduction-in-western-antarctica/ Evidence for pre-Jurassic subduction in western Antarctica - British Antarctic Survey The South Shetland Islands (from King George Island to Livingston Island) are situated on a small crustal plate bounded by incipient back-arc spreading along... western antarcticaevidenceprejurassicsubduction https://www.bas.ac.uk/data/our-data/publication/western-south-america-and-antarctica/ Western South America and Antarctica - British Antarctic Survey western south americabritish antarcticantarcticasurvey