I need more information to determine which American city is older because of a specific rock. There are many instances where rocks have played a significant role in establishing the age of American cities. For example:
Archaeological sites: The presence of ancient rock formations or artifacts made from specific rocks can indicate the presence of human settlements long before the establishment of modern cities. For instance, the discovery of Clovis points, stone tools dating back to around 13,000 years ago, in Clovis, New Mexico, has contributed to the city’s recognition as an ancient settlement area.
Geological formations: The age of underlying bedrock can sometimes provide clues about the city’s age. For example, the city of Prescott, Arizona, is situated on top of Precambrian granite, one of the oldest rock types on Earth, suggesting that the area has been inhabited for millions of years.
Fossil records: The presence of fossils in rocks can reveal the geological history of an area and indirectly indicate the potential for human habitation. For instance, the abundance of dinosaur fossils in the Morrison Formation around Dinosaur, Colorado, has helped establish the region’s ancient past and contributed to the city’s recognition as a paleontological hotspot.
Please provide more details about the specific rock formation or geological event you have in mind, and I’ll be happy to assist you in identifying the American city it relates to.