In these two images when you look beyond the Joshua trees you are looking roughly northwest along the ancient fault line known as the Red Rock Escarpment. I searched for some geologic research papers on the geology of this wonderful piece of art but found nothing I liked to link to.
The west side of this fault line has sloping mountainous terrain and is part of the beautiful Lovell Canyon. I wish I had the health to hike into these mountains as it’s so beautiful on the Lovell Canyon side as well. I’ll wrap up this rather large set I took with the new Nikon Z-6 camera today.