old orogenic belt; Palaeozoic mountain belt
Geological term referring to mountain belts formed during the Palaeozoic era. Used in academic and educational contexts.
Old orogenic belts refer to mountain ranges formed during the Palaeozoic era.
Refers to newer orogenic belts formed in the Mesozoic to Cenozoic eras, contrasting with the older Palaeozoic belts.
General term for orogenic belt; 古期造山帯 specifies the older, Palaeozoic ones.
Compound of 古期 (old period) + 造山帯 (orogenic belt). The term is a modern geological classification.