The Big Horn Mountains 60 miles to the west supplied the sediment of this exposed section of Tullock Formation (Fm). Tullock Fm. consists of alluvial fan and swamp deposits all the way back to the mountains. Sediments washing off the newly risen peaks were filling up the coterminously formed sedimentary basin (Powder River Basin). The huge coal mines we have here are mining the coal formed in those swamps at the base of the Proto-BigHorn Mountains. Those mountains were much higher when they were young plus the basin was deeper.
Huge blocks of the earths crust uplifted and correspondingly downwarped 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.
Understanding the geology here takes many books to read, its a long list and growing 🤔😀📷
Location: near the Bliss DInosaur Ranch, WYoming/Montana borderlands
Can you smell the wet sage and the ozone yet? Hear the distant rumbles of the thunder? As this HUGE MesoCyclone sitting over the whole northeast corner of the Wyoming and the southeast corner of Montana. This storm certainly spans the MT/WY border and probably is over in South Dakota as well. You can just see the edge of it to right frame. These big 40,000 foot high storms can be 100 miles across. Big spinning tops of a thunderstorm is a good way of thinking about MesoCyclones. They are the way we get most of our summer rain. Having moved over us the unfettered sun really popped in the refractions going on within the raindrops in the far distance. I’d estimate that rainbow is 1 mile out.
I see a lot of rainbows as I actually go to work after rain showers move through. It makes for a “Trip up on Ridge 1”. You know… go up the hill to see what is going on to the east. I see afternoon rainbows like this 10 to 1 over morning rainbows historically. Rainbows will move as you move. If I could have gained say 1000 feet in elevation magically I would have seen a full circle rainbow. A drone footage of a rainbow would show a big circle/halo of color. You see this with the 22 degree halos around the sun/moon. But rainbow alway present behind you when your facing he sun/moon. They are always down stream so to speak.
You might also notice that the order of color ROYGBIV is reversed to VIBGYOR on the double component of this twin rainbow.
JUST as the sun came up, lighting up that 15 mile distant ridge. Bright sunlight was about 10 feet over my head at the time. Less than aminute before I was lit up by the sun for my timeline.. In the distance the bright was working it’s way down the hill sides. The rain in the distance was far enough away to be a worth telephoto image. I was well over 200 yards out from Momma Angus to get her in focus along with the background with this long lens. Distance is your friend.
OK, another F-stop discussion…. High F-stop numbers take away a LOT of light from your light capture boxes. (camera). The higher the number, the smaller the hole in the lens for light to travel through. At the same time you make that hole smaller by turning up the F-stop number, you are thickening the “depth of field” focus depth. F-stop becomes a double edged sword. You can open up the aperture (turn down the f-stop number) and get a lot more light versus a pin hole at maximum fstop setting. But you loose depth of field/focus depth) So Bigger hole in the lens= shallow depth of field but a lot of light. A smaller hole in the aperture means less light but it gives you the ability to focus on things close AND far at the same time.
SO, you have to compensate for HIGH f stop numbers by adjusting the other two settings. Turning up camera sensitivity (ISO) boosts what little light that comes through a small hole in the lens. IT’s a double edge sword too though. More Camera Sensitivity (higher ISO) will give you a grainy image and introduce color noise. Speckles and big grain are not desirable so moderation is necessary.
Lastly you have shutter speed. Slower than 100th of a second you risk blurring the cow. Any movement from her would blur under longer exposures. Rule of thumb is 1/100th for minimum handheld telephoto (rested).