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As you know, that means that something is missing, possibly because the land was high and being eroded at that time!
I have only marked the most significant unconformities.
BIOSTRATIGRAPHY AND SERIATION Biostratigraphy is the method of using fossils to determine the age of one stratigraphic section relative to another.
Traditionally, a stratigraphic section is measured and a taxon-by-level matrix is produced.
Trilobite (an extinct early crab like critter) trails and worm tracks are present.
800' thick reddish and vermilion mudstones and shales interbedded with minor sandstone.
They occur above and below the Zoroaster Granite, at the base of the Temple Butte Limestone, and at the base of the Surprise Canyon Formation. The upper part of the group is non-marine and tracks of quadrupeds are found on bed tops.
These tracks are believed to have been made by amphibians or primitive reptiles.
This formation is generally eroded to a smooth slope.The metamorphism occurred after the rocks were buried to great depth by mountain building.This formation is now tilted up and in places approaches vertical. Although stratigraphically below the Vishnu Schist in many parts of the canyon, this intrusive igneous rocks is actually younger in age.Granites of this sort are associated with uplift and formation of mountain ranges. Formed by metamorphism of rocks that were originally sedimentary.