- GLOSSARY OF VOLCANIC TERMS
A group of hot pyroclastic deposits (ignimbrites) that cools at more or less the same time. A deposit from a single eruption that shows simple variations in the degree of welding is known as a simple cooling unit. When many ignimbrites occur over an extremely short period of time, each individual ignimbrite may be deposited, and start to weld over a previous deposit or group of deposits that are cooling and undergoing welding. The resulting deposits have several zones of partial and dense welding, and since they more or less cool together, are known as compound cooling units (Cas and Wright, 1987, p. 253-255).
Glossary of volcanic terms. - University of Wisconsin Oshkosh. G. J. Hudak. 2001.
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