- Building type: Church
- Date of construction: 1826
- Architect: Not Assigned
- Listing: B
- HB/SMR Ref: HB14/16/001
- 2nd Survey by EHS: No
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St. Mark's Church, Church Street, Portadown
County Armagh
Gothic Revival style church, cruciform in plan, consisting of nave, transepts, and sides aisles with gabled porches. Fronted by a tall square tower with octagonal buttresses. Cast stone dressings on tower, sandstone dressings to basalt walls. Pitched slate roof
| Stone Type Category: | Basalt |
| Primary Stone Type: | Basalt |
| Secondary Stone Type: | Dungannon Sandstone |
| Other Stone Type: | |
| Replacement Stone Type: | English Carboniferous Sandstone |
| Stonework Construction: | Un-coursed rock-faced rubble |
| Stonework Condition: | Basalt is in good condition but sandstone shows some evidence of deterioration through loss of surface material and some historic corner deterioration of sandstone blocks associated with the use of a 'hard' mortar. |
| Condition Assessment (QUB): | 1 |
