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El Viejo
El Viejo is the oldest from the volcanoes that make up the tres virgenes. It’s made up of three lava domes which are in oldest to youngest : the lower viejo dacite, puerta dacite, and the upper viejo dacite. The Lower Viejo dacite dome is overlain by the puerta dacite dome and has a 0.1 km thick lobe-like lava. The dome has light gray lava with mottled structure due to the abundance of enclaves which are dark gray aphanitic that come in different shapes. The puerta dacite is well exposed compared to the other two domes. The dome is covered by a blocky lava surface with a crumble breccia at the base. It is 0.19 km thich and the lava contained subrounded 10 cm enclaves. The last dome being the  youngest is the Upper Viejo dacite and this doem has a blocky surface as well and it contains subrounded enclaves. The average thickness of the dome is 0.26 km.

El Azufre
This volcano has block and ash flow which pyroclastic fans that are dissected by radial drainage and at the fan toe is limited by volcaniclastic deposits. The average thickness is 0.1 km and it covers an area of 7.5 km. Then it also consists of a dacite central dome which is located atop the  Azufre Volcano. It has a height of 0.3 km and an exposed area of 0.78 km. The lava varies from dark-gray  to pinkish-gray and the dome shows sub-rounded lava blocks with dark gray enclaves.

El Virgen
El Virgen is by far the most conspicuous of the three. It is made up of at least 6 scoria cones all spread out around the Virgen volcano. Three of these cones are on the southern flank of El Azufre and they have elongated and coalesced shapes and are crudely aligned in N-S direction. They cover an area of 0.46 km and alberga a height of 0.06km. These scoria cones consist of massive grain supported poorly sorted fallout beds. It also consists of 6 andesite lava being the Cueva de Gel, Lower Pintos,Upper Pintos, Lower Virgen,Pintos dacite, and Upper Virgen andesite lava. Adding to the andesites has one neck which serves as a feeding vent of the volcano and is almost entirely covered by younger deposits of the volcano. The Virgen dacite lava cone is the only cone and represents the main structure of the La Virgen strap cone. As well as there being many andesite lavas there are 4 lava domes. The Mezquital dacite lava dome is made up of two and and and they are located on the southern apron of the Virgen volcano.El Virgen is by far the most complex of the three volcanoes as you can see by everything that it consists of such as the lavas, cones, and domes.