limestone
Life on Earth is carbon based, so all animals with skeletons and shells use carbon. A more 'common' element used in skeletons and shells is calcium.
It was the skeletons/shells of living animals and plants.
Limestone is a rock that is formed from the skeletal remains of sea animals and plants. It is primarily composed of calcium carbonate, which is derived from the shells and skeletons of marine organisms such as coral, mollusks, and foraminifera. Over time, these remains accumulate and become compacted and cemented to form limestone rock.
Coquina is a sedimentary rock fitting that description.
Shale rock is indirectly formed of skeletons and ancient coral animals. Clay minerals and tiny fragments of minerals like quartz and calcite make up shale. Calcite comes from the reaction of CaCO3, or calcium carbonate with Hydrogen ions. CaCO3 is a component of shells and bones.
Shale
Shale
limestone forms from skeletons and shells
Shale Rock
A sedimentary rock formed from deposits of shells is called limestone. Limestone is made up primarily of calcium carbonate, which is derived from the shells of marine organisms like coral or shellfish.
Limestone deposits suggest that they were formed in a marine environment, typically in shallow, warm, and calm waters where the accumulation of calcium carbonate skeletons and shells of marine organisms was prevalent. The presence of fossils within limestone can indicate the past biodiversity and environmental conditions of the area where the deposits formed. Additionally, the purity and composition of the limestone can provide clues about the depositional processes and the source of the materials.
Limestone is a rock that can be formed through the accumulation of animal shells and skeletons, called biogenic limestone, or through the precipitation of calcium carbonate from evaporating seawater, known as chemical limestone.