Profil
Haranggaol terletak di dalam teluk kecil di sektor utara Kaldera Toba. Itu milik dinding kaldera. Di wilayah ini terdapat tonjolan batu yang berasal dari beberapa periode pembentukan kaldera, Lava Andesit Haranggaol (1,3 Ma), ditutupi oleh Haranggaol Dacitic Tuff (HDT; 1,2 Ma), Tufa Toba Tengah (MTT; 0,5 Ma) ) dan Toba Tuf Bungsu (YTT; 0,074 Ma).
Haranggaol is situated within a small bay in the northern sector of the Toba Caldera. It is belong to the caldera wall. In this region there are rock outcrops that originate from several caldera-forming periods, Haranggaol Andesitic Lava (1,3 Ma), covered by Haranggaol Dacitic Tuff (HDT; 1,2 Ma), Middle Toba Tuff (MTT; 0,5 Ma) and Youngest Toba Tuf (YTT; 0,074 Ma).
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