Meet Eotriceratops xerinsularis, an early and larger version of Triceratops recently dug out of the ground near the Horseshoe Canyon formation at Dry Island Buffalo Jump, about 70 kilometres northwest of Drumheller. Apparently, the skull is a "monster" at three metres long, or the size of Smart Car. I'd be interested in hearing the precise measurements. As far as I know, the record for "biggest dinosaur skull" goes to Pentaceratops, one specimen of which reached a little under ten feet in length. I suppose if this was bigger you'd hear about it.
Now on display at Drumheller's Tyrell museum.