Here's why:
* Limestone formation: Limestone forms from the accumulation of the skeletons and shells of marine organisms like corals, clams, and foraminifera. Over time, these remains are cemented together, forming limestone.
* Marble formation: When limestone is subjected to intense heat and pressure, typically deep within the Earth's crust, it undergoes a process called metamorphism. This transformation changes the rock's mineral composition and structure.
* Fossil destruction: The intense heat and pressure during metamorphism usually destroy any fossils present in the original limestone. The organic matter within the fossils is destroyed, leaving behind only the mineralized shell or skeleton.
So, while fossils may be present in the original limestone that formed marble, they are typically destroyed during the metamorphic process. You might occasionally find traces of fossil shapes or outlines in marble, but the original fossil is no longer intact.
