Figure F12. Photographs of facies changes within sequences. The interval from 810 to 814 ft (246.89 to 248.11 m) illustrates the change from lower HST prodelta clays to upper HST shelf sands. Note the laminations in the clays below 812 ft (247.50 m). The interval from 634 to 638 ft (193.24 to 194.46 m) illustrates the change from LST marsh sediments below to neritic sands above.