You are browsing the archive for columnar jointing Archives - Georneys.
July 1, 2013
This week’s Monday Geology Picture is courtesy of my friends Jimmy and Vera, who recently visited Japan. In addition to seeing some real volcanoes, they also saw a fake volcano and some fake geology at DisneySea, a marine themed Disney park in Tokyo. The scenery includes some spectacular– if fake– columnar jointing.
November 18, 2012
def. Columnar Jointing: A structure that forms in rocks (most commonly in basalt) that consists of columns (mostly commonly hexagonal in shape) that are separated by joints or fractures in the rock that formed when the rock contracted, most often during cooling. Columnar jointing is always a joy to observe in rocks in the field. Stumbling upon perfectly geometric columns of rock can only be described as magical. Even the …