WAJV - Washington Jurassic Volcanoes Guide
A guide to volcanic rocks produced by Jurassic Volcanoes in Washington State

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WAJV - Washington Jurassic Volcanoes Guide



a guide to volcanic rocks produced by Jurassic Volcanoes in Washington State

Pre Middle Jurassic volcanic rocks found in Washington State

Primary rock type: greenstone

Secondary rock type: spilite

Other rock types: slate; argillite; graywacke; keratophyre; amphibolite; diorite

Middle Jurassic volcanic rocks found in Washington State

Primary rock type: andesite

Secondary rock type: dacite

Other rock types: argillite; slate; graywacke

Upper Jurassic volcanic rocks found in Washington State

Primary rock type: aphanitic (volcanic rock)

Secondary rock type: phaneritic (plutonic rock)

Other rock types: metavolcanic rock, metasedimentary rock, sedimentary rock






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