2026-06-27T13:55:52Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/603912023-08-27T20:47:39Zcom_20.500.14352_14col_20.500.14352_15

Pieren Pidal, Agustín Pedro Gutiérrez Marco, Juan Carlos 2023-06-20T20:31:01Z 2023-06-20T20:31:01Z 1990 0213-683X https://hdl.handle.net/20.500.14352/60391 http://www.sociedadgeologica.es/publicaciones_geogaceta.html The Silurian sequen ce in the Herrera del Duque syncline (Southern Central /berian zone) starts with 20 m. of black shales (Guadarranquejo Formation) which lay disconformably upon the Hirnantian diamictites (Gualija Formation). Within the black shales, eight graptolite horizons have been recorded (A-H) and two (/-1) at the base of the overlying sandy alternances. A Telychian (post-Turriculatus Zone) age for the Guadarranquejo Formation has been suggested, the L1andovery/Wenlock boundary Iying probably near its top. spa open access Datos bioestratigráficos de los materiales silúricos del Sinclinal de Herrera del Duque (Badajoz) journal article