The Crossover UniverseTM is a companion blog to the books Crossovers: A Secret Chronology of the World Volumes 1-2 by Win Scott Eckert, and the forthcoming Crossovers Expanded Volumes 1-2 by Sean Levin. Material excerpted from Crossovers Volumes 1 & 2 is © copyright 2010-2014 by Win Scott Eckert. All rights reserved. Material excerpted from Crossovers Expanded Volumes 1 & 2 is © copyright 2014-present by Sean Levin. All rights reserved.
I seem to remember hearing that the Wynonna Earp comics where in an alternate universe where the supernatural was widely known, but I can't find anything about that online and haven't read the comics so I could be wrong. I assume at least you read these issues so perhaps you would know better than I. Tanna leaves appeared in an episode of Gargoyles too.
I actually haven't read them, but Jay Lindsey told me about the story, and he usually mentions it when he posts crossover info on Yahoo or FB that a story takes place in an AU of that kind. Since he didn't, and I can't find any info to that effect online, I'm assuming this one still works.
And I do have the Gargoyles episode written up as well.
It could be I'm thinking about something else. What it is I think I got it confused with the Anita Blake book series. (Though there's a CU version of Blake.)Gargoyles after the second season could be considered an AU like the Buffy comics. Or the revelation of real, living Gargoyles, was only taken seriously in NY.Of course, Gargoyles fans famously pretend the third season did not happen, preferring the comic continuation.