Sometime in the late 80's/early 90's I read a short story about a group of people (I think they were researchers at a university) who go back in time to change something, and then keep going back again and again to try and undo their changes.
I don't remember why they went back in time in the first place; most (all?) of the action of the story is just the characters discussing what went wrong with their last trip, after they return to the present which gets weirder and weirder each time.
The only details I can positively remember are:
- One of the time-travelers gets erased from history on one of the trips.
- At one point, the "present" the travelers return to is almost exactly like the Nunyuninni scene from American Gods--the characters are in a smoky tent and they take turns putting their heads in a mammoth skull to speak.
I hope someone else has read and remembered this.
EDIT: The scene in "my" story may not be as close as I thought to the Nunyuninni bit in American Gods; the more I think about it, the more sure I am that the characters were using a mask (and not a skull) to speak through.