Is the clock on a rock is set as soon as it begins to erode.?

The phrase "the clock on a rock is set as soon as it begins to erode" suggests that erosion marks the beginning of a geological process that can be measured over time. Erosion can indicate environmental changes and the age of geological formations, but it doesn't provide a precise timestamp for when the rock formed. Instead, it represents ongoing processes that affect the rock's surface and structure. Thus, while erosion is significant in geological timelines, it's just one aspect of a rock's history.