Usage Note
Geológico agrees in gender and number: era geológica (geological era), estratos geológicos (geological strata). The g before e is pronounced as a hard English 'h', so the first syllable is /heh-/, not /geh-/. The related noun is geología (geology, feminine).
Examples
"El terremoto dejó importantes marcas geológicas."
Natural Translation
The earthquake left significant geological marks.

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