A Land of Fire and Water
Posted by: Groundspeak Premium Member Volcanoguy
N 45° 51.334 W 123° 57.762
10T E 425262 N 5078450
This sign is located at South Silver Point VP.
Waymark Code: WM13E0
Location: Oregon, United States
Date Posted: 01/02/2007
Published By:Groundspeak Premium Member silverquill
Views: 19

This geologic history sign is one of six interpretive signs at the south Silver Point VP.

Marker Name: A Land of Fire and Water
Marker Text: The jagged sea stacks and towering rocks along the Oregon coast are carved from the mainland by powerful storm waves. But what causes the waves to wear away some areas and leave others to stand sentinel behind? The answer lies in geologic history.
17 million years ago - This region was underwater. Over the course of the next five million years, a series of enormous basalt lava flows issued from vents near the Idaho border and flowed down the ancestral Columbia River to the ocean.
12 to 15 million years ago - Plunging into the soft marine sediments, the molten basalt spread out in layers many miles underground and re-erupted through the seafloor as secondary submarine volcanoes.
Around 10 million years ago - The molten rock had solidified within volcanic conduits to form cylindrical intrusions; sometimes it cooled to form sheet-like dikes and sills, or irregularly shaped bulbous masses. Uplift and erosion began.
10 million years ago to present - The seafloor uplifted by several thousand feet and became the mountains of the Coast Range. As the ocean pounded at the shores, it eroded away the softer marine sediments leaving the harder basalt behind to form headlands and sea stacks.

Historic Topic: Geological

Group Responsible for placement: State of Oregon

Marker Type: Roadside

Region: Coast

County: Clatsop

State of Oregon Historical Marker "Beaver Board": Not listed

Web link to additional information: Not listed

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Recent Visits/Logs:
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sth2878 visited A Land of Fire and Water 07/10/2021 sth2878 visited it
Walking Boots visited A Land of Fire and Water 04/27/2019 Walking Boots visited it
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