An important form in which CO2  is stored is limestone. It most often stems from the shells of tiny, shell-forming plankton organisms. In the Jurassic and in the following Cretaceous there were outstanding conditions for the evolution of carbonate plankton. There was relatively much CO2 in the atmosphere, it was warm and the oceans were filled with nutrients. Thus a regular blooming of plankton forms occurred.

Limestone as a messenger from the past and as a natural resource

The book of nature is written in limestone. Almost everything that we know about earlier eras has been provided by limestone – as an impression or a fossil. Sometimes even raindrop impressions are preserved.

Chapter 8