Microfósiles del Neógeno de la Diatomita de Santiago, Baja California Sur, México
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El estudio bioestratigráfico de los sedimentos diatomíticos que afloran en la parte más austral de Baja California, para el cual se utilizó foraminíferos planctónicos, bentónicos y nannoplancton calcáreo, permite asignar una edad de miocénica tardía a pliocénica media a la Diatomita Santiago, que aflora cerca de capas del Plioceno superior. Estos sedimentos fueron depositados durante un evento transgresivo, como resultado de la apertura tectónica local del Golfo de California que formó una paleobahía, cuyo máximo centro de depósito fue el área de Santiago. La información micropaleontológica obtenida indica, para la Diatomita Santiago, una paleoprofundidad batial superior, con un conjunto transicional característico de masas de agua asociadas a la corriente de California y al sistema Nordecuatorial, las cuales convergen en esta área. En términos generales, se puede considerar que predominaron condiciones marinas normales durante el depósito, con excepción de algunas capas de sedimentos laminados, que sugieren decremento en el contenido de oxígeno. La ausencia de algunos taxa, así como la presencia de microfósiles calcáreos parcialmente disueltos, puede atribuirse a depósitos cercanos al límite de compensación del carbonato o a una surgencia local. Se interpreta la evolución de la paleobahía Santiago, la cual señala una probable asociación con un cañón subaéreo preexistente, la posterior sumersión y finalmente un evento regresivo durante el Pleistoceno.
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