sentences:  The church building on Abercromby Street, completed in 1842, is protected as a category A listed building.A number of parishes pre-date St Mary's (St Mary's, Greenock, and St Mirin, Paisley; both 1808, St Patrick, Dumbarton, 1830, St Margaret, Airdrie, 1836; St. John, Barrhead, St Mary, Duntocher, and St Fillan, Houston; all 1841), but of all of these only Saint Margaret's, Airdrie, still has the original church (opened 1836).Airdrie is now in the Diocese of Motherwell, hence St Mary's Calton's claim to be second oldest in the Archdiocese of Glasgow.