Fr T.J. Linane, From Abel to Zundolovich, Vol. 2: Biographies of Priests on the Australian Scene up to 1900, 1980, p 69:

Collomb, Jean Georges, Most Rev., SM, Savoyard, Visitor
Tragic Death of a Youthful Bishop
The story of the apparent failure of the Marists, and later of the Milanese Fathers (PIMEs), to plant the Cross in the Vicariate of Melanesia-Micronesia is by-passed here. Fr. Frank Mecham, P.P. Lindfield, has written in F.P. Vol. 2, No. 9, on the Milanese priests who came to Sydney from Rook Island after the failure in reference. And Fr. Don Hughes OMI, Massey, N.Z., explains in this issue, (Vol. 2, No. 8) under an article entitled: 'Mazenod, Founder' why the Oblate Fathers refused the Melanesian-Micronesian assignment. Two great disasters for the Marists in this difficult mission were, first, the massacre of Bishop Epalle in December 1845, and second, the untimely death of Bishop Collomb a few years later - a victim of malaria and dysentery. Further biographical details from Fr. John Hosie's list of Marists in the Pacific are: born in Tarantaise Diocese on 30 April 1816; professed on 26 October 1845; appointed Vicar Apostolic of Melanesia-Micronesia on 23 May 1847. He passed through Sydney in the same year, going on to New Zealand to receive episcopal consecration. He succumbed at Umboi, Rook Island, on 16 July 1848 at the early age of 32.
(Footprints, Vol. 2, No. 8)
Ref.: As quoted.

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Fr. Michael Fitzgerald, SM and Fr. François Grossin, SM, Alive in Memory: A Biographic Necrology of Oceania Marist Province 1836-2011, 4th edition, Suva, 2011, pp 153-154, 296:

Bishop Georges Collomb, d. 1848
Pioneer - Melanesian Mission
Solomons Islands
He was born in Savoie, France in 1816. He studied in Turin receiving doctorates in theology, civil and ecclesiastical law. Ordained at the age of 23, he became a professor at a diocesan seminary. He felt called to the Missions and was professed in the Society in 1845 at the age of 29. On the same day, he was appointed Coadjutor Bishop to Bishop Epalle, and the next month left for Oceania, hoping to be ordained by Bishop Epalle when he arrived there. In Tahiti, he received news of the death of Bishop Epalle. In 1847 he arrived in Melanesia and stopped for a few days at the mission on San Cristobal-Makira before going to New Zealand, where he was ordained by Bishop Viard. On his way back to his Melanesian mission, he stopped at the mission at Balade in New Caledonia to leave some supplies. He narrowly escaped death there when the mission was burned and Br. Blaise Marmoiton killed. He returned to San Cristobal, accompanied by the now recuperated Fr. Montrouzier, and finding 3 more missionaries killed, moved the mission to Woodlark Island. After a short time he went with two priests to begin a new mission on Rooke Island. Within a few months he died of a fever, aged 32.