Madilogo is an isolated cinder cone on the SW side of the Owen Stanley Range about 50 km NE of Port Moresby. It was first discovered as a volcano in 1969 and has a small summit crater and a 1 km long lava flow. It probably erupted less than 1000 years ago.

from Smithsonian / GVP Madilogo volcano infirmation:

Madilogo is an isolated, well-preserved pyroclastic cone located on the SW side of the Owen Stanley Range about 50 km NE of Port Moresby. The small volcano, which was not recognized until 1969, rises about 250 m from the flood plain of the Naoro River. A lava flow extends 1 km to the west from the breached summit crater. The pyroclastic cone and lava flow were considered on the basis of revegetation rates and soil profiles to probably be less than 1000 years old and possibly as young as a few hundred years (Blake, 1976).



Reference:

- Blake D H (1976) "Madilogo, late Quaternary volcano near Port Moresby, Papua New Guinea." In: Johnson R W (ed) "Volcanism in Australasia", Amsterdam: Elsevier, p 253-258