The oligarchs continue to accrete until planetesimals are exhausted in the disk around them. When planets form in a gaseous protoplanetary disk, they accrete hydrogen/helium envelopes. The more massive planetesimals accrete some smaller ones, while others shatter in collisions. Fish otoliths accrete layers of calcium carbonate and gelatinous matrix throughout their lives. These laminations can accrete over time, resulting in the banded pattern common to stromatolites. In other words, angular momentum should be "transported" outwards for matter to accrete. Uncollected litter can accrete and flow into streams, local bays and estuaries. The cholesterol contained in bile will occasionally accrete into lumps in the gallbladder, forming gallstones. Elsewhere, snow can accrete on power lines as "sleeves" of rime ice. Ice may also accrete onto the underside of the shelf. When protoplanets accrete more material, the energy of impact causes local heating. Over the next 5 years, or upon certain events, SoftBank's ownership will accrete to 70%. Traders and peasants continued to accrete throughout the next three centuries.