CONNOR: Good thinking! I read a bit about limestone on the bus journey. Limestone is a sedimentary rock created by layers of skeletons and shells of sea creatures found in ancient, warm ...

Mudstone, shale, and limestone are examples of sedimentary rock likely to contain fossils ... Reading the layers is complicated by the fact that as continents move and mountains rise, the layers are ...

Limestone, made from calcium carbonate, takes millions of years to form. These sedimentary rocks are born from the decay and ...