The site of St Mark's church lies on the A4212 at Frongoch. The church was built in the Early English style to designs of M.Penson of Chester. The plan comprised chancel and nave, north vestry and south porch, with western bell gable. It was consecrated on 19 August 1858. In 1909 it was restored. The church has since been demolished.
Historical source: D.R.Thomas, History of the Diocese of St Asaph vol.3 (1913), p.95.

David Leighton, RCAHMW, 16 October 2014