A broad area of Quaternary volcanic rocks lies in a sparsely populated highland between Cofre de Perote and Las Cumbres volcanoes. Two large arcuate east-facing scarps of uncertain origin are the most prominent features of the La Gloria volcanic field, whose name originates from the town at its NW base. The complex is also known as the Desconocido-Tecomales volcanic field. Numerous pyroclastic cones, some of which have a youthful morphology, are scattered throughout the complex on both sides of the escarpments. The age of the most recent eruptions in this poorly studied region is not known, although some lava flows were classified by Negendank et al. (1985) as Holocene based on their youthful morphology.