Pyroclastic sheet deposits are thin lava flows that often exhibit columnar jointing.

Name: Pyroclastic sheet deposits are thin lava flows that often exhibit columnar jointing.
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Pyroclastic sheet deposits result from explosive volcanic eruptions and consist of tephra (volcanic ash, lapilli, volcanic bombs) spread over a wide area, not thin lava flows. Columnar jointing is typically associated with the cooling and contraction of thick lava flows, not pyroclastic deposits.

Pyroclastic Sheet Deposits Are Thin Lava Flows That Often Exhibit