摘要
Over approximately the past quarter-century, fine-grained sedimentary rocks deposited in Mesozoic lakes in what is now northeast China have produced numerous spectacular fossils of primitive birds and closely-related non-avian theropod dinosaurs.Supplemented by other discoveries from around the world, these specimens have demonstrated that the transition to birds was not an orderly linear progression but rather an evolutionary radiation that gave rise to a number of disparate,often short-lived clades[1].
基金
the National Sciences and Engineering Research Council of Canada (Discovery Grant RGPIN-2017-06246) for financial support
