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West Elk Breccia, Curecanti National Recreation Area, 2013.
Summary
The West Elk Breccia is formed from a huge volcanic lahar (i.e., volcanic flow) of ash and debris that spewed from violent, pyroclastic eruptions (i.e., spitting/fountaining lava is thrown into the air along with other volcanic byproducts) in the West Elk Mountains about 30 million years ago. The West Elk Breccia contains angular rock fragments stuck together by a matrix of fine volcanic ash and mud. The larger rocks resist erosion and weathering, sheltering the rock immediately beneath it. That's what forms the conspicuous spire-like pinnacles.
Nothing Found.
Tags
west elk breccia
breccia
volcanic rock
rock
formation
sillon pinnacles
geology
geological formation
erosion
curecanti national recreation area
rocks
west elk mountains
ash
rock fragments
pyroclastic eruptions
million years
spire like pinnacles
national parks gallery
colorado
gunnison
mountains
Date
2013
Source
National Parks Gallery
Link
Copyright info
Public Domain Dedication