Naolinco volcanic field

[6] In its eastern region lies the Cofre de Perote and a group of volcanoes including the Naolinco Volcanic Field.

[1] Potassium-argon dating of the field has yielded ages of 1.2 and 0.82 million years ago.

[1] The most recent activity at Naolinco occurred at Rincon de Chapultepec, which erupted the Coacotzintla lava flow 2,980 years before present.

[8] This lava flow reached a length of 6 kilometres (3.7 mi) and a surface area of 8.1 square kilometres (3.1 sq mi); the total volume of lava is about 122,000,000 cubic metres (4.3×109 cu ft).

[11] Two more recent eruptions occurred at Volcancillo[15] and produced the more than 40 kilometres (25 mi) long Naolinco lava flow.