Tephrochronologic and volcanologic
studies of silicic fallout tufts in Miocene basins of the Northern Basin and Range Province, USA.
and geophysic studies were done in the 80s and 90s (Jaramillo 1980, Thouret 1988, Schaefer 1995, Williams et al.
Therefore, we are in favor that more detailed mapping and volcanologic
stratigraphic columns are necessary to make a complete picture of the oceanic basic complexes.
It is occasionally suggested that the term caldera be restricted only to large collapse craters formed by ignimbrite eruption, but in the strict sense this is incorrect and inconsistent with general usage in the geologic and volcanologic
This deposit is one of the larger volcanologic
massive sulphide bodies known, with drill indicated resources totaling seven million tonnes grading 17.