Here we see a picture of a Jurassic sandstone from the USA, notice the layers. Each layer is a record of an event in the past. This is made from pebbles and smaller stones stuck together in a matrix. Limestone Limestones are made from fragments of sea creatures that sank to the bottom of ancient tropical seas. Many limestones from Southern England are made from dissolved lime which builds up around sand grains to form tiny spheres called oolites.
Limestones frequently contain fossils.
Here we see a stalactite from the limestone cave system a few miles away in Ingleton. These are simply just mud hardened into rock. They consist of much finer particles than sand .They often contain fossils. 6 Heat and Pressure - Metamorphic Rocks Earth movements can push all types of rock deeper into the Earth. These rocks are then subjected to massive temperatures and pressures causing the crystalline structure and texture to change.