This cross-section is'nt pinpoint accurate,but it corroborates with the data provided by Wikipedia and the USGS.
Note the lower paleozoic is not found underneath the next level.
I believe that the line to the left of the phrase "paleozoic rocks" shows how the paleozoic rocks extends. If the area under the layered areas said Proterozoic, you might have a case.
The image you provided was created by a geologist by the name of Ron Blakely who is a geologist at Arizona State University and has written extensively on the geologic history of the Grand Staircase. Here are a couple more of his pictures if you think there is any confusion.
If you have some doubts, you can write him. I am quite confident what he will tell you. Can you show me where on Wikipedia or the USGS you saw anything that supports your view?
Could you tell my why you think forest covered by volcanic eruptions,lahars,landslides,and other local catastrophic events should of all happened during a global flood?I don't know of any creationists that would claim Mt. St. Helens occured during the flood or any other post-flood catastrophe.
Of course, I don't see any evidence for a worldwide flood. I see upright fossil forests showing what they appear to be. I see huge buried salt flats showing clear evidence of ancient salt lakes. I see huge old stromatolites, and animal tracks and and coral reefs and delicate crinoids buried where they lived and vast volcanic layers large enough to cover the whole earth to a depth of several feet. Do you fully realize how much volcanic material exists above the Cambrian layers on the planet? All these phenomena are not found at the lowest layers but interspersed throughout the sedimentary layers.
When I see a 50 ton stromatolite or a fossil forest or a coral reef half buried on top of 2 miles of sedimentary layers in the middle of a desert, I don't have a problem. I don't need to figure out how it was "transported" there upright. I see evidence of a form of life that grew in that spot for many thousands of years when the conditions supported that life.