Figure 3. a, Tuffaceous interval in the Miembro Conglomerados of the Mount Flora Formation (section in Fig. 2b) subdivided into a lower part (LP), middle part (MP) and upper part (UP). From base to top: 1) Partially welded breccia deposited in energetic conditions of a pyroclastic density current; 2) Intercalated, lensoidal, ash and lapilli beds accumulated in fluctuating granular regime of the pyroclastic density current; 3) Clast-supported conglomerate with whitish clasts of volcanic rocks representing the background sedimentation of the alluvial fan, interbedded with conglomerates with tuffaceous matrix and angular volcanic clasts interpreted as lahar deposits. 4) Reversely-graded, lithic-rich breccias deposited through the lower flow boundary of a pyroclastic density current. 5) Lapilli tuff and 6) Top Breccia forming the main body of the pyroclastic density current deposits. b, Dike (1) cutting across a conglomerate (2) and the uppermost breccia (3) in the upper part of the tuffaceous interval. 4.2 Plants