Here are four types of trace fossils, focusing solely on the types and not their specific examples:

1. Trails: These represent the markings left by an organism's movement, such as the tracks of a dinosaur or the trails of a worm.

2. Burrows: These are the excavations made by organisms within a substrate (like sediment or wood) for shelter, feeding, or reproduction.

3. Borings: These are holes drilled or excavated by organisms into hard surfaces like rocks, wood, or shells.

4. Coprolites: These are fossilized feces, providing insights into an organism's diet and digestion.

Let me know if you'd like more detail on any of these types!