Began as a short story in Death Rattle (Kitchen Sink Press, 1985 series) #8 (December 1986).
There was a second print of #1-3, all January 1989; with second print of #6 also thought to exist. There has been a brief second series, as: Xenozoic Tales (Dark Horse, 2003 series)
This title was the source for the Saturday morning cartoon, Cadillacs and Dinosaurs and has been reprinted as Cadillacs and Dinosaurs (various publishers) & Xenozoic (Flesk Publications, 2010 Series). Artist/creator Mark Schultz has been the subject of several retrospectives.