Zdzislaw Belka Boris Chuvashov Brian A. Engel Peter J. Jones Jurgen Kullmann John Utting Lynn Watney Dieter Weyer Manfred Menning 2001 The number of global Carboniferous series and stages should be consistent with those of the neighbouring Devonian and Permian systems. Therefore, two series and seven to nine stages are preferred instead of two subsystems, seven to nine series, and 21 to 35 stages. application/pdf 10.1127/nos/38/2001/201 en Schweizerbart Science Publishers The optimal number of carboniferous series and stages article