The Far Eastern Mountains

The Thiel Mountains are part of the far-eastern mountains that extend from the Ohio Range of the HorUck Mountains to the east coast of the WeddeU Sea. The rocks exposed along the north-facing escarpment of the Thiel Mountains consist of undeformed sedimentary rocks of low metamorphic grade (Mt. Walcott Formation) that are overlain by the cordierite-bearing hypersthene-quartz-monzonite porphyry of the Thiel Mountains Porphyry. This unit is a massive deposit of crystal-rich silicic tuff that contains cordierite and hypersthene as xenocrysts and in small granuhte xenoliths. The presence of cordierite in this volcanic or shallow intrusive... 

The Beacon rocks occur not only in southern Victoria Land in Fig. 10.4 but characterizes the Transantarctic Mountains from northern Victoria Land to the Ohio Range of the Horlick Mountains. They continue from there to the far-eastern mountains described in Chapter 8 including the Pensacola Mountains, the Shackleton Range, the Theron Mountains, and even the Kottas Mountains on the coast of the Weddell Sea in Queen Maud Land (Poscher 1989 Barrett 1991). 

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