It's impossible to say definitively what Chuar Butte would look like today if it were made only of shale without a detailed geological analysis and simulation. However, we can make some educated guesses based on the properties of shale and the forces that have shaped the Grand Canyon:

Here's what we know about shale:

* Soft and easily eroded: Shale is a sedimentary rock formed from compressed mud and clay. It's relatively soft and easily eroded by water and wind.

* Layered: Shale is typically layered, with different layers potentially having different colors and compositions.

* Resistant to weathering: While easily eroded, shale can also be resistant to weathering, depending on its composition and the presence of minerals like iron oxides.

Considering these properties, here's how Chuar Butte might look if it were made only of shale:

* Lower elevation: The softer nature of shale would likely lead to a lower elevation than the current Chuar Butte, which is composed of more resistant rock types like sandstone.

* Rounded slopes: Due to the erosion potential, the butte would likely have more rounded slopes compared to the steeper, more angular cliffs of the current Chuar Butte.

* Layered appearance: The layered nature of shale might create distinct bands of color and texture across the butte, reflecting the variations in the original mud and clay deposits.

* Potential for badlands: Depending on the specific type of shale and the local weather conditions, the butte could be shaped into a badlands-like landscape with a maze of deep canyons and gullies.

Important Notes:

* Current erosion: The Grand Canyon's formation is a result of millions of years of erosion by the Colorado River and its tributaries. Even a shale butte would be affected by this ongoing erosion, shaping its form over time.

* Geological context: The composition and structure of the surrounding rock formations would also play a role in how the shale butte would look.

* Geological history: The current Chuar Butte sits on a foundation of Precambrian rocks, which would also impact the shape and composition of a hypothetical shale butte.

Ultimately, imagining the appearance of Chuar Butte with only shale is a thought experiment. The actual landscape would be a result of complex geological interactions and processes that are hard to fully predict.