Deep Stone
Geologic Event
Exotic Terranes
moving crust carries large bodies of rock from distant locations and welds them to the edge of the continent
(295-150 million years ago)
This Timestone is made of blueschist, a rare rock that forms in subduction zones where ocean crust sinks deep into the mantle only to rapidly return to the surface in the chaos of mixed and broken rock that forms where plates collide. The rapid journey to unfathomable depths changes black basalt into a layered rock studded with blue glaucophane and tiny red garnets.
Before the exotic terranes built the foundation of Oregon, there was only an ancient Pacific Ocean, beneath which an endless conveyor of ocean crust passed by on its way to subduction further east. However, the mantle was always present beneath the crust, so the base for this Timestone is peridotite, the rock that makes up much of the mantle.
Stone and base from Curry County
Exotic Terranes
moving crust carries large bodies of rock from distant locations and welds them to the edge of the continent
(295-150 million years ago)
This Timestone is made of blueschist, a rare rock that forms in subduction zones where ocean crust sinks deep into the mantle only to rapidly return to the surface in the chaos of mixed and broken rock that forms where plates collide. The rapid journey to unfathomable depths changes black basalt into a layered rock studded with blue glaucophane and tiny red garnets.
Before the exotic terranes built the foundation of Oregon, there was only an ancient Pacific Ocean, beneath which an endless conveyor of ocean crust passed by on its way to subduction further east. However, the mantle was always present beneath the crust, so the base for this Timestone is peridotite, the rock that makes up much of the mantle.
Stone and base from Curry County
