Why are Limestone reefs and salt deposits are important rocks in the reconstruction of Earth history?

Limestone reefs and salt deposits are crucial for reconstructing Earth history because they serve as indicators of past environmental conditions and biological activity. Limestone, formed from the accumulation of marine organisms' calcium carbonate shells, reveals information about ancient marine ecosystems and climatic changes. Salt deposits often indicate arid conditions and can provide insights into past sea levels and tectonic activity. Together, these rock types help scientists understand the Earth's geological and biological evolution over millions of years.