4 - Eyri (Snowdonia) National Park - Views
Columnar Jointing
Looking over a section of Columnar Jointing at Terynn Bluffs.
Grib Coch in the background.
The joints arise when a pattern of tensional forces is set up in a layer of lava as it contracts
on cooling. The forces tend to pull open a series of hexagonal fractures.
Ref: NW 2825
Date: 01/12/2023
Location: NW 6431 5464
