New standard graptolite zonal sequence after the "big crisis" at the Wenlockian/Ludlovian boundary (Silurian)
- 10 August 1991
- journal article
- Published by Schweizerbart in Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen
- Vol. 182 (3) , 303-354
- https://doi.org/10.1127/njgpa/182/1991/303
Abstract
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