The split

Another landscape photo taken at Red Rock Coulee in SE Alberta. We left Calgary on Monday morning, 20 September 2013, and had to reach Elkwater in the Cypress Hills (not that far from the Saskatchewan border), several hours' drive away, where we were going to stay in a little rustic cabin for three nights. On the way there, we stopped at Red Rock Coulee, which is just 56 kms (35 mi) southwest of Medicine Hat. Some of the huge red concretions had split in half, like the one in this image. This is Rattlesnake territory, too, but fortunately we didn't come across any, thank goodness! At least, not here, but one was seen (not by me!) at the Pinhorn Grazing Lease, when we were monitoring the Yucca plants.

"The main feature of this natural landscape is the huge red boulders; some measuring 2.5 m across. They are scattered over a relatively small distance. Bedrock is close to the surface in this area, covered by only a thin layer of soil. Water erosion has carved the landscape over time and a badlands topography has formed in places. The bands of colour visible in the exposed bedrock are made of dark gray shales, greenish and gray sandstones, bentonitic clays and thin bands of ironstone.

The most striking features of this landscape are the round reddish boulders. These are sandstone concretions and at up to 2.5 m in diameter, they are among the largest in the world. The boulders were formed in prehistoric seas as layers of sand, calcite and iron oxide collected around a nucleus formed by shells, leaves or bones. The concretions grew larger as the circulating waters deposited more layers. The reddish colour comes from iron oxide." From Wikipedia.

en.wikipedia.org/wiki/Red_Rock_Coulee