Callipterid is an important and highly heterogeneous group of fossil plants in the Permian continental strata of the northern hemisphere, in which Callipteris conferta(Sternberg)Brongniart is the most famous represent...Callipterid is an important and highly heterogeneous group of fossil plants in the Permian continental strata of the northern hemisphere, in which Callipteris conferta(Sternberg)Brongniart is the most famous representative because its first appearance in the strata was considered as an index fossil for the beginning of the Permian terrestrial depos-展开更多
文摘Callipterid is an important and highly heterogeneous group of fossil plants in the Permian continental strata of the northern hemisphere, in which Callipteris conferta(Sternberg)Brongniart is the most famous representative because its first appearance in the strata was considered as an index fossil for the beginning of the Permian terrestrial depos-