The general order of sediment types is as follows:

1. Clay - the smallest particles, typically less than 0.002 mm.
2. Silt - larger than clay but smaller than sand, ranging from 0.002 mm to 0.063 mm.
3. Sand - particles that range from 0.063 mm to 2 mm.
4. Pebble - sized between 4 mm and 64 mm.
5. Cobble - sizes between 64 mm and 256 mm.
6. Boulder - the largest category, with sizes over 256 mm.