The pressure and folding have transformed limestone into quartz, shale, and marble, altering the original character of the deposits. [1]
Limestone deposits, including trilobite shells from 340,000,000 years ago, built up thick layers over Europe and North America, now seen in the Carrara marble of the southern Alps. [2] Limestone can form through chemical precipitation and marine deposition, creating layers of fossil-free stratified stone on ancient ocean bottoms. [3]
See also: UB 59:4.5.