 In addition felsic pyroclastic rocks are very common in places and one sandstone-conglomerate lava flow can be found.The sedimentary breccia is dominated by pebble to boulder size angular metasedimentary stratas, and a few crystal tuff layers that contain about 1% biotite, the only such high amount of a typically trace mineral outside of Rothea formation in the Extracaldera sequence.A pumice-ridden lapilli-tuff section near the believed top section additionally has a 1% composition of the mineral amphibole.