What is a Fossil? A fossil is an organism, creature, plant or burrow that lived millions of years ago. Fossils have the same density as rocks and weigh roughly the same. Fossils are preserved in rock or clay. The first form of life evolved 4 billion years ago, but the first visible life was 2 billion years ago. Life on land first appeared 380 million years ago. Igneous is a name for volcanic rocks, you will not find Fossils in these.
How Fossils are formed? 1. The creature dies and sinks to the rock, sand or silt. 2. Layers of rock build up on top causing a massive weight, this turns the fossil into a mineral (normally calcite). 3. Plate movement brings the layers lower. 4. Quarries are built and fossils are found.
What do fossils look like? There are many types of fossils, each one is unique. You can recognize a fossil from it's texture and color. Fossils have different texture but do not look like rock. Fossils often have a different color from the natural rock.