Solimana is an extinct volcano. It was active during the Miocene and Pliocene between 4 and 1.5 million years ago, with the last eruption occurring between 500,000 and 300,000 years ago. The collapses occurred at some time between 3.05 and 1.5 million years ago and after the collapse volcanism became centered inside the collapse scar and its margins, with the youngest activity forming phreatomagmatic deposits within the caldera and a scoria cone on its south.