The La Joya Formation is a Jurassic period geologic formation in north central Mexico. Mesozoic Sedimentary and Tectonic History of North-central Mexico, Issue 340; pg 221; edited by Claudio Bartolini, James Lee Wilson, Timothy Frost Lawton. It is located in the Sierra Madre Oriental range, in southwestern Tamaulipas state."Petrology of the Middle Jurassic La Joya Formation, Sierra Madre Oriental, Southwestern Tamaulipas, Mexico"; Allen, Woods Wilkinson; 1976 Master's thesis, Texas A&M University"Stratigraphy and petrology of the Middle Jurassic La Joya Formation, Miquihuana, Aramberri-Mezquital, and Real de Catorce areas, Mexico"; by Joel Joseph Lazzeri; University of New Orleans, 1979
It preserves fossils dating back to the Jurassic period.
See also List of fossiliferous stratigraphic units in Mexico
References