At the end of 1981, my institution began a relationship with the Aranguti Family that has grown more intense with each passing year.

It was during this time that we became aware of the lithographic limestone and flag stone quarries owned by the family, near the town of Tepexi de Rodríguez in the State of Puebla, about 220 km (138 miles) south east of Mexico City, in a region known as the Mixteca-Poblana.

Today, we know that of the 15 great fossil localities of the world, the Tlayúa quarry is certainly one of them. These remarkable deposits, no larger than...

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