▁Grid ) ▁lake ▁map ▁of ▁ 3 0 / 4 / 1 8 5 9 . ▁His ▁lake ▁research ▁was ▁later ▁published ▁in ▁his ▁Geographic ▁and ▁Ge ological ▁survey ▁where ▁the ▁formation ▁of ▁the ▁terra ces ▁was ▁also ▁exam ined . ▁A ▁commission ed ▁map ▁by ▁August ▁Pet ermann ▁was ▁included ▁in ▁that ▁work ▁and ▁ ▁this ▁was ▁considered ▁valid ▁ ▁until ▁ 2 0 1 1 ▁when ▁S as cha ▁N old en ▁discovered ▁Hoch st etter ' s ▁original ▁maps ▁in ▁Switzerland ▁and ▁rep atri ated ▁them ▁to ▁New ▁Zealand ▁in ▁digital ▁form . ▁In ▁ 2 0 1 7 ▁the ▁Hoch st etter ▁and ▁Pet ermann ▁maps ▁were ▁compared ▁and ▁Pet ermann ' s ▁map ▁found ▁defect ive . ▁Hoch st etter ' s ▁ 3 0 / 4 / 1 8 5 9 ▁map ▁is ▁now ▁considered ▁the ▁more ▁accurate ▁map ▁of ▁Lake ▁Rot om ah ana . ▁▁ ▁In ▁ 1 8 7 3 , ▁Per cy ▁Smith ▁clim bed ▁M t . ▁T ara wer a ▁and ▁gave ▁the ▁impression ▁that ▁the ▁mountain ▁top ▁was ▁rough ▁but ▁showed ▁no ▁sign ▁of ▁vol can ic ▁v ents . ▁In ▁March ▁ 1 8 8 1 , ▁G . ▁Se el hor st ▁clim bed ▁W ah anga ▁d ome ▁and ▁the ▁northern ▁end ▁of ▁Ru aw ah ia ▁d ome ▁in ▁search ▁of ▁a ▁pres umed ▁" fall ing ▁star " ▁following ▁reports ▁of ▁g low ing ▁and ▁smoke ▁from ▁an ▁area ▁behind ▁W ah anga . ▁In