Aside from the caldera, the field contains about 300 individual volcanic vents with diverse morphologies distributed in a western Los Volcanes group that reaches to the Rio Grande River and the eastern Guadaloso and El Rengo groups. These fields are also known as West Payún Matrú or West Payén and East Payún Matrú or East Payén, respectively. Two further ruptures, known as Chapua and Puente, have been identified east of Payún Matrú. All these groups include fissure vents, lapilli cones, scoria cones and strombolian cones. These edifices are up to high and are associated with lava flows and pyroclastic units; the vents in the Los Volcanes group are spread across two separate belts. Wind-driven ash transport has formed ash tails at individual vents.