The Purico ignimbrite contains three flow units, the two Lower Purico Ignimbrites and the Upper Purico Ignimbrite. Their thicknesses differ; the Upper ignimbrite is thick while the two lower ones together reach an average thickness of , with a maximum of . The lowermost Lower Purico Ignimbrite is one single flow. The upper Lower Purico Ignimbrite is more heterogeneous, starting with a base surge, a pumice layer and then another flow unit, which is volumetrically the largest part. The Lower Purico Ignimbrite covers a surface of primarily on the western side of the Purico complex. Finally, the Upper Purico Ignimbrite is a moderately to densely welded flow that occurs particularly close to the summit of the Purico complex, where it forms six flow units that contain fiamme textures. Characteristic for the Purico ignimbrite is the so-called banded pumice, which consist of alternating darker mafic and brighter components, in the upper 33% of the ignimbrite. The extrusion of the Purico ignimbrite was accompanied by the eruption of large amounts of tephra, some of which fell as far as the Coastal Cordillera west of Purico.