In sedimentary processes, which particles are likely to be deposited last?

In sedimentary processes, the smallest and lightest particles are most likely to be deposited last due to their low settling velocity in water or air. Large and dense particles tend to settle quickly because they are affected more by gravity. Medium-sized particles will also settle more quickly than smaller particles, as they have less resistance to the flow of the transporting medium.

Small, light particles, while they may initially be suspended in a fluid due to turbulence, will take longer to settle once the energy from the transporting medium decreases. This means they will remain suspended longer than larger particles, making it likely that they will be deposited after other, larger and denser particles have already settled to the bottom. Additionally, their fine texture allows them to be carried further away from the initial source before they settle out, which contributes to their late deposition relative to other particle sizes.