Pengram Corp. (PNGM)

[DollarsOnPennies]

PNGM - Passive eruptive sequences of flows and domes are the most abundant volcanic assemblages. Explosive pyroclastics occur throughout the Caldera Complex, but are most common towards its west-central parts. Intimate with both the passive and explosive volcanic assemblages is a highly variable assemblage of lahars and fanglomerates, coarse and fine-grained fluvial assemblages and locally, chemically deposited siliceous sinters that comprise volcaniclastic sediments that are here interpreted as parts of a "moat" facies. Rock units of the moat facies from recessive assemblages and are very poorly exposed. The distribution of these three facies assemblages within the caldera suggests the presence of a number of separate basins within the larger caldera structure.