English: Types of biozones. Each rectangle represents bodies of sedimentary rocks and each line a different taxon. The arrows indicate the taxon first or last appearance. Based on Vera Torres, J.A. (1994). Estratigrafía. Principios y métodos. Madrid: Ed. Rueda. p. 336 (in Spanish)
Español: Tipos de biozonas. Cada rectángulo representa cuerpos de rocas sedimentarias y cada línea un taxón diferente. Las flechas indican primera o última aparición de un taxón. Basado en Vera Torres, J. A. (1994). Estratigrafía. Principios y métodos. Madrid: Ed Rueda. pág. 336
This is a retouched picture, which means that it has been digitally altered from its original version. Modifications: Translation to English. The original can be viewed here: Tipos de biozonas.svg: . Modifications made by PePeEfe.
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