case DNGN_ALTAR_CHRONOS:

            Feature[i].minimap     = MF_FEATURE;
            break;
        case DNGN_ALTAR_CHRONOS:
            Feature[i].colour      = DARKGREY;
            Feature[i].dchar       = DCHAR_ALTAR;
            Feature[i].flags      |= FFT_NOTABLE;
            Feature[i].map_colour  = DARKGREY;
            Feature[i].seen_colour = DARKGREY;

    case DNGN_ALTAR_CHRONOS:
        return TILE_DNGN_ALTAR_CHRONOS;

dngn_altar DNGN_ALTAR_CHRONOS

    case DNGN_ALTAR_CHRONOS:
        return ("snail-covered altar of Chronos");