ajo ▁Mountains ▁and ▁the ▁Henry ▁Mountains , ▁formed ▁around ▁ igne ous ▁intr us ions ▁of ▁about ▁the ▁same ▁age . ▁ ▁Yet ▁other ▁nearby ▁ranges , ▁such ▁as ▁the ▁Car ri zo ▁Mountains ▁and ▁U te ▁Mountain , ▁formed ▁about ▁otherwise ▁similar ▁intr us ions ▁emp la ced ▁about ▁ 7 0 ▁million ▁years ▁ago . ▁ ▁Form ation ▁of ▁these ▁ igne ous ▁rocks ▁in ▁two ▁distinct ▁time ▁intervals ▁has ▁attract ed ▁the ▁interest ▁of ▁scient ists ▁seeking ▁explan ations ▁for ▁mag ma ▁production ▁below ▁relatively ▁stable ▁parts ▁of ▁the ▁Earth ' s ▁cr ust . ▁ ▁Pe aks ▁of ▁the ▁La ▁Sal ▁Mountains ▁ ▁The ▁significant ▁pe aks ▁of ▁the ▁La ▁Sal ▁Mountains ▁are : ▁ ▁Mount ▁Pe ale ▁- ▁▁ ▁Mount ▁M ell enth in ▁- ▁▁ ▁Mount ▁Tu ku hn ik iv atz ▁- ▁▁ ▁Mount ▁Wa as ▁- ▁▁ ▁Mann s ▁Pe ak ▁- ▁▁ ▁Mount ▁La ure l ▁- ▁▁ ▁Mount ▁Tom as aki ▁- ▁▁ ▁Pil ot ▁Mountain ▁- ▁▁ ▁Green ▁Mountain ▁- ▁▁ ▁Little ▁T uk ▁- ▁▁ ▁Castle ▁Pe ak ▁- ▁▁ ▁La ▁Sal ▁Pe ak ▁- ▁ ▁See ▁also ▁G ey ser ▁Pass ▁ ▁References ▁Jules ▁D . ▁Fried man ▁and ▁A . ▁Curt is ▁H uff man , ▁Jr ., ▁Co ordin ators , ▁Lac col ith ▁Comple xes ▁of ▁S out he astern ▁Ut ah : ▁Time ▁of ▁Emp lacement ▁and ▁T ect onic ▁Setting — Work shop ▁Pro ceed ings , ▁United ▁States ▁Ge ological ▁Survey ▁Bul letin ▁