Photos are of different individual butterflies.
Newtonbrook Creek Ravine.
DSF - on crushed limestone, basking in sun. Or minerals.
Marginata form, imbibing at moist sand and gravel on the trail.
I encountered this butterfly on a walk up Milkmen’s Road in the Rosedale neighborhood of the city of Toronto on a sunny weekday with a high temperature of 15C.
I think that this butterfly is an Eastern Comma. This butterfly has 3 “post median” black marks on the forewing rather than 4, and an uneven edge of the hindwing rather than straight. The white mark on the underside of the hindwing appears to be continuous (a comma) rather than broken (a question mark).