Does a sedimentary rock contains shells and skeletons of marine animals such as coral?

Yes, sedimentary rocks often contain shells and skeletons of marine animals, including corals. These fossils are typically found in limestone and other sedimentary formations that have formed from the accumulation of organic material and sediments in aquatic environments. Over time, the remains of these organisms become embedded in the rock as it undergoes lithification. Thus, sedimentary rocks can provide valuable insights into past marine ecosystems.