The bristling teeth of Anhanguera piscator were for snagging fish. (Photo: Robert Clark)
By Richard Conniff/National Geographic
Heading out into the geological layer cake of Big Bend National Park in southwestern Texas, British pterosaur researcher Dave Martill proposes a “to do” list for this brief reconnaissance: 1.) Find a rattlesnake to admire. 2.) “Find a complete Quetzalcoatlus skull sitting on the ground.” The odds are almost infinitely better for item one. But he and Nizar Ibrahim, a fellow paleontologist, promptly fall into a detailed discussion about how to obtain a research permit in the event of item two.
This is the first rule of pterosaur research: You need to be an optimist. Thinking you will go out on a given day and find any trace of pterosaurs—the winged dragons that ruled Mesozoic skies for 162 million years–is like buying a Powerball ticket and expecting to win. Pterosaur fossils are vanishingly rare. Their whole splendid world, built on hollow bones with paper-thin walls, has long since collapsed into dust. Scarcity is especially the rule for Quetzalcoatlus northropi, thought to be one of the largest flying animals that ever lived, nearly as tall as a giraffe, with a 35-foot wingspan, and a likely penchant for picking off baby dinosaurs. It’s known from a few fragments discovered at Big Bend in 1971, and not much else.
Ibrahim and Martill at Big Bend (Photo: Richard Conniff)
Martill and Ibrahim spend three days bone-hunting among the fissured hillsides. They cross and re-cross the promisingly named “Pterodactyl Ridge,” frequently consulting the “x-marks-the-spot” on maps left by the discoverer of Quetzalcoatlus. They decipher the nuances of geological strata (“Look at that Malinkovitch-controlled cyclicity!” Martill exclaims, referring to the way the Earth’s shifting movements show up in the rock), and they conjure up forgotten worlds. On a sandstone ridge with no obvious way down, Martill remarks, “Haven’t found a mountain yet we can’t fall down,” plunges forward, and emerges unscathed below, eyes fixed on the passing landscape.
They do not, however, stumble across any rattlesnakes, nor even the faintest whiff of a pterosaur. The femur of an Alamosaurus, the largest North American dinosaur that ever lived, turns up, by way of consolation. But dinosaurs are not pterosaurs, or vice versa. Leaving the park, the two paleontologists are already mapping out a return search for Quetzalcoatlus, permanently hooked on the tantalizing pterosaur mix of extreme biological richness glimpsed through the rarest of fossil remains.
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Optimism against all odds has, however, lately begun to look almost reasonable in pterosaur research, with a rush of discoveries revealing Read the rest of this entry »
