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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A volcanic dam is a natural dam produced by volcanic activity. There are two main types: lava dams and pyroclastic dams. Lava dams are formed by huge lava flows during numerous successive eruptions through numerous vents, usually without violent eruptions. Example include The Barrier, which impounds Garibaldi Lake in southwestern British Columbia, Canada. Pyroclastic dams are produced by massive pyroclastic flows and they are made by pyroclastic rocks: agglomerates, tephra, volcanic ash cemented into tuffs, mafic of felsic.