Limestone may have been deposited by microorganisms in the Precambrian, prior to 540 million years ago, but inorganic processes were probably more important and likely took place in an ocean more highly oversaturated in calcium carbonate than the modern ocean.

When was limestone discovered?

It was discovered that limestone, when burnt and combined with water, produced a material that would harden with age. The earliest documented use of lime as a construction material was approximately 4000 BC when it was used in Egypt for plastering the pyramids.

Where was limestone first discovered?

Limestone flooring can be traced back to modern Israel as far back as 7000 BCE.