Encore - Dike and Hoodoos Along the Upper Missouri River in Montana

October 05, 2019

MontanaMissouriRuins_02 (3)

Today and every Saturday Earth Science Picture of the Day invites you to rediscover favorites from the past. Saturday posts feature an EPOD that was chosen by viewers like you in our monthly Viewers' Choice polls. Join us as we look back at these intriguing and captivating images.

PJanuary 2014 Viewer's Choicehotographer: Kathleen Kiefer
Summary Author: Kathleen Kiefer

The photo above was snapped while paddling the Wild and Scenic Upper Missouri River in west-central Montana. At center is a remnant of an igneous dike -- a formerly subterranean crack that filled in with magma. Note that this dike makes a path to the draw below. Hot magma was flowing here, forced upwards from deep within the Earth, some 55 million years ago, at a time when this area was covered by thousands of feet of overlaying rock layers. Eroded sandstone pedestals on the left side of the large, rectangular rock formation, at right center, are known as hoodoos. Yucca plants are in the foreground. Photo taken on September 27, 2013.

Photo Details: Camera: Canon EOS 5D Mark III; Lens: EF24-105mm f/4L IS USM; Focal Length: 28mm; Focus Distance: 3.39m; Aperture: f/10.0; Exposure Time: 0.0050 s (1/200); ISO equiv: 100; Software: Adobe Photoshop CS5.1 Windows.