Boot Heel volcanic field
 The Boot Heel volcanic field is located in the Bootheel region of southwest New Mexico adjacent areas of southeastern Arizona and northwest Mexico. The field covers an area of more than 24000 km2. The field includes nine volcanic calderas ranging in age from 26.9 to 35.3 Ma. Extrusive products include rhyolitic ignimbrites along with basalt andesite and rhyolite lava flows.