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Hello, I recently acquired some fossils from the Vallecillo member of the Agua Nueva formation. The Agua Nueva Lagerstätten is famous for its perfectly preserved fish and marine reptiles. It is late cenomanian in age about 90-93 million years old. I got two large ammonites from one of my trips to Mexico. I was wondering if someone can identify it to the family, and possibly the genus level. They are preserved in a finely bedded shale. 

 

 

This one one is the largest one it is about 8 inches long. 

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