Profil
Urutan kaldera Toba Selatan terbuka baik di sepanjang sisi jalan Dolok Sanggul turun ke Bakara, di mana YTT yang tidak dilas diduduki di dataran tinggi dan diikuti oleh YTT yang dilas dan kemudian dilas OTT. Dataran Bakara dibentuk oleh puing-puing dinding kaldera, terdiri dari fragmen basement metalimestone, meta-sandstone, dan juga Blok Welded Oldest Toba. Dinding sisi jalan Bakara ke Tipang dibangun oleh OTT yang dilas, juga seperti yang ditemukan di air terjun Janji. Pulau-pulau kecil Simamora dibentuk oleh puing-puing blok OTT.
Southern Toba Caldera sequence is good exposed along road side of Dolok Sanggul going down to Bakara, where the non-welded YTT occupied on plateau and succesively follows by the welded-YTT and then welded OTT. Plain of Bakara is formed by debris of the caldera wall, consists of the basement fragments of metalimestones, meta-sandstone, and also the block of welded Oldest Toba Tuff. The road-side wall of Bakara to Tipang is contructed by the welded OTT,also as found in the Janji waterfall. Small islands of Simamora is formed by the ruin of the OTT blocks.
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