It turns out that more is known of the mammalian megafauna that lived in the state during the Cenozoic (due, in part, to specimens unearthed at the La Brea Tar Pits) than about the dinosaurs of the state's Mesozoic age. So I ended up combining creatures from all three major prehistoric periods of California's history on one map, rather than just depicting the state's dinosaurs, as originally planned. Each creature is linked to its time period with markers preceding their species' names and a corresponding key on the right side of the map.
Here are a few of the original ink drawings included in the piece--of the Giant Ground Sloth, two species of Ankylosaur, and the Pygmy Mammoth. These are some of my favorite prehistoric creatures anyway, so finding that they inhabited the California of yesteryear was pretty exciting.