Why is it hard to create a timeline of events chronicling eatths history?

Creating a timeline of Earth's history is challenging due to the vast timescales involved, spanning billions of years. Geological and biological events often overlap and are not uniformly preserved in the rock record, leading to gaps and uneven distributions of evidence. Additionally, dating methods can have varying degrees of accuracy, and new discoveries frequently revise our understanding of past events. This complexity makes it difficult to create a clear and comprehensive chronological account.