Split and merge into it. Answer by Acchilles. Confidence votes 2.1K. Loose rock fragments can be caused by weathering, or indeed erosion. They can be found in a scree slope, and alluvial fan, a beach, in the soil (they are the soil, sometimes).Loose rock fragments are known to a geologist as 'Unconsolidated sediment' which can be classified into various groups.oose rock fragments can be caused by weathering, or indeed erosion. They can be found in a scree slope, and alluvial fan, a beach, in the soil (they are the soil, sometimes).