larger rocks require more force to be moved by the water, so they are less likely to be transported further downstream. As the water speed increases, smaller rocks are easier to be picked up and carried by the flowing water, while larger rocks remain more grounded in place. This is why larger rocks tend to be deposited sooner in the sedimentary process. Additionally, larger rocks may create obstacles or barriers in the flow of water, causing sediment to accumulate around them, further contributing to their earlier deposition.
