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Index fossil
01
fósil índice, fósil guía
a fossilized organism that is useful for dating and correlating the strata in which it is found, typically indicative of a particular time period in Earth's geological history
Ejemplos
The presence of ammonite shells in a layer serves as an index fossil for the Jurassic period.
La presencia de conchas de amonitas en una capa sirve como fósil índice para el período Jurásico.
