National Geographic : 2010 Oct
again of the controversial stratigraphy of Cuddie Springs, of the layers where megafauna and hu- man tools may be associated, of the history of the enmity among the scientists. As I listened, she suddenly said, "Are you very tired?" My chin was cradled in my hand---I guess I looked as though I was about to put my head down on the table. "I'm sorry I wasn't able to crystallize the story for you," she said weeks later on the phone. "Oh, it's crystal clear," I said. "It's a perfect muddle." But we'll muddle on. Science is a laborious process, and sometimes progress comes only with many stumbles and blind alleys. ink of Rod Wells in Victoria Fossil Cave, slithering on his belly through passages so narrow that he had to turn his head sideways to squeeze forward. Scrambling. Digging. Sometimes we will strike an impassable obsta- cle and have to back up the way we came. j On a drying lake bed in Victoria, a farmer in 2007 alerted scientists to a major find: well-preserved tracks of a Diprotodon. The slow-moving behemoth had been crossing a volcanic plain 100,000 years ago, when megafauna still walked tall.