Introduction to the “Golden Nail”: The “Golden Nail” is the Global Stratotype Profile and Stratotype Point (GSSP). The "Golden Nail" in Guzhang is the "Golden Nail" at the bottom of the 7th level of the Cambrian system. It is about 503 million years old. It is located next to the S229 Provincial Road in the park. It is a rock formation type 20 meters high and about 150 meters long. profile. Experts discovered a "globus trilobite" fossil that is only 8 millimeters in size and looks like a peanut in a complete set of limestone formations. This is the first time that a globe trilobite fossil has appeared in this layer. Thus marking the beginning of a new phase. The "Golden Nails" now has three monuments and five marble explanatory monuments, which are protected by projects established by the Ministry of Land and Resources and the Ministry of Finance.