[3] On January 12, 1984, He was consecrated bishop by then Apostolic Nuncio to the Philippines, Archbishop Bruno Torpigliani at the Saint Peter Metropolitan Cathedral.

[4] Before his episcopal ordination, Talamayan founded on February 11, 1967, the Lyceum of Aparri, the mother school of the Archdiocese of Tuguegarao and the Thomas Aquinas Major Seminary (TAMS).

In the field of culture and heritage, he established the Cagayan Ecclesiastical Museum which is located within the Lyceum of Aparri campus in 1967.

Archbishop Talamayan also founded the order of Eucharistic Healers of Mary whose charism was to take care of sick and elderly priests.

[5] During Talamayan's 75th birthday on October 19, Philippines President Gloria Arroyo inaugurated the carillon bells at the Santo Nino Prish and Shrine, San Gabriel, Tuguegarao City, an added attraction in the region being the first and only bell system in Cagayan Valley.

The birthday celebration also marked the end of his tenure as pastor of the entire archdiocese, with the dioceses of Ilagan and Bayombong covering the provinces of Isabela, and Nueva Vizcaya and Quirino, respectively.