Most games can get away with creating just a few types of vegetation and pasting them around the world, but Saurian’s devotion to paleontological truth made creating its Hell Creek an enormous job. The team wanted at least 25 species, from ground cover to trees, plus variations of each, including saplings and partially grown examples. The result was the need to create between 100 and 150 models. “There are lots of mixed-up records about family groups,” Turinetti says, describing the process of finding real-world analogues on which to base the recreations as a “multi-year odyssey”. Ginkgoes were easy, since they haven’t changed in millions of years; others were far trickier, such as Dryophyllum, which science has regularly moved between different plant families. Eventually, the team realised it’s similar to a walnut tree and discovered a species from South East Asia to base it on, with leaves that closely resemble the fossils.