Taken off the road on the way to Gillette Wyoming. I’m Traveling the “back way”. All gravel, no AAA, no cell phone service, but the radio works lol. I pass one or two trucks on this road (30 miles long) each time I take it. Unless the weather is screwy or it’s really early, this road I’m on is a relatively busy place.
I stand on ground at the same elevation as the Intervening ridge. . Right at 4000 feet above mean sea level. Now those peaks off in the distance, that’s the BigHorn Mountains. The tall peaks in that little eroded wrinkle in the earth’s crust are just now 13000 feet high. The billions of year old granite core of the continent exposed in the center of the range. All of the sediments that used to be up much higher than the core. All those eroded and filled up the big bathtub between my camera and those peaks. The Powder River Basin between has 6000 plus feet of JUST Tullock formation. The Tullock, an alluvial fan deposit, stretches from the Mtn’s to the camera.
The Coal Swamps that allowed the Powder River Basin (bath tub at the foot of the Big Horn Mtn uplift). Think of it like a sine wave with mountains on the high side of the wave and the Powder River Basin is the trough. The top of the wave erodes and fills up the trough. Those sediments from the peaks flowed toward me and reached the hill I’m standing on. It’s all Tertiary Tullock Formation. All that big bathtub filled up with sediment laid down AFTER the dinosaurs died. It was a low area adjacent to highlands thus the swamps and all the coal the Powder River Basin produces.
Location: 13 miles south of Bliss DInosaur Ranch, Wyoming/Montana borderlands. (Wyotana)
From My viewpoint at 130 miles out. This area of the sky is the size of your thumb at an arms length on the horizon. The BigHorn Mountains Cloud Cover that night was climbing up the back of the peaks. It was to cover the highest ones within a few minutes of this image collection. I had a visual window to the peaks that lasted at most a few minutes. The sun was still over head and this was very bright and hard to see. The lighting was high overhead and slightly oblique to the images. It’s a tough photographic environment lol.
Getting to see weather move over these 13,000 feet high ridges is a rare treat from this far away.
These huge blocks of the earths crust uplifted during a major tectonic compression episode called the Laramide Orogeny. Cloud peak is 13,175 feet and is visible in this image. The same compressional forces that uplifted the peaks, also downwarped the adjacent basin to the east. This Basin called the Powder River Basin. This basin the major source of coal in the US. The burning of this coal generates 30 percent of the electricity generated in the United States.
My ranch coincidentally sits directly on the western most edge of the Wyoming Black Hills. It is actually JUST east of the edge of the Powder River Basin. If I drive 2 miles west, I start to see alluvial fan sediment. These sediment fans stretch all the way from the Big Horns. Dissected into ridges by huge rivers washing off the peaks during glaciation. . These alluvial deposits are far reaching, called the “Tullock/Fort Union” formation. Major Mountain sized Anticlines and Synclines resulted from the continental wide compression.. Huge were the forces bending even the underlying crystalline Pre-Cambrian rocks. The rocks to clay washing off of those peaks filled the basin and washed just about to my front door.