 It has a strip exposed on the surface that includes the Florentine Synclinorium, The Adamsfield District, the Jubilee Region, and down to the South Coast at Precipitous Bluff and Surprise Bay.It also underlies the Tasmania Basin across southeastern Tasmania, but not including the east coast.The subsurface structure has been studied from a few outliers, boreholes, xenoliths, and gravity and magnetic surveys.