Early Paleozoic radiolarian biozonation

Current knowledge of early Paleozoic radiolarians permits the recognition o f faunal assemblages and zones that constitute a biozonation. This new zona tion utilizes robust and relatively common, easily recognized morphotypes. It will facilitate rapid acquisition of previously unavailable age constrai nts for marine siliceous sedimentary successions in hitherto poorly underst ood early Paleozoic orogenic collages.