The calcium carbonate precipitated out of the water and eventually solidified into limestone. Numerous marine organisms used the dissolved calcium carbonate in the seawater to form internal skeletons ...

The team led by the University of Cambridge published their study in the journal Nature and thought that the new fossil could attest to why birds survived the mass extinction event at the end of ...

Mudstone, shale, and limestone are examples of sedimentary rock likely to contain fossils. As the layers of sediment build up on top of one another, they create a physical timeline. The oldest layers, ...