Thunder Bay Architecture used a lot of Tyndall stone!
“The Revenue Canada Building is an impressive, three-storey, stone-clad building prominently located on a corner site in Thunder Bay. It is designed in the Beaux-Arts Classical style and it is distinguished by its compact, temple-like form and rich, classically-inspired decoration. This includes, two-storey paired pilasters that separate two-storey arch-topped windows, rusticated corner pilasters, a massive entablature and a central pedimented entryway. The designation is confined to the footprint of the building.” from HistoricPlaces.ca
“The original Fort William Collegiate Institute building, which was eight or ten rooms, underwent massive reconstruction in 1918, under the leadership of local architect R.E. Mason. At this time the Vocational Wing of the present institution was added. A second addition was constructed in 1925, and a third in 1970.” from https://www.thunderbay.ca/en/city-hall/resources/Documents/HistoryHeritageandRecords/Fort-William-Collegiate-Institute.pdf