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You are browsing the archive for 2014 April 03.

3 April 2014

Cribratina, an index fossil for the Albian age

These four slabs, collected at “Fossil Hill,” north of the Cristo Rey laccolith at the Chihuahua (Mexico) / Texas / New Mexico triple point, bear positively-weathering fossils of the benthic foraminiferid called Cribratina, an index fossil for the Albian age / stage: My field notebook serves as an imperfect sense of scale. Here’s the Albian in the context of the middle of the Cretaceous period of geologic time, from the …

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