Wall of Brine says it creates a wall 10 ft/level long, 5 ft/level high, and 5 ft thick. It also says this wall is shapeable, using the '(S)' denotation. Shapeable, in this case, means:
If an area or effect entry ends with “(S),” you can shape the spell. A shaped effect or area can have no dimension smaller than 10 feet. Many effects or areas are given as cubes to make it easy to model irregular shapes. Three-dimensional volumes are most often needed to define aerial or underwat1er effects and areas.
Wall of Stone is also shapeable, and states:
A wall of stone is 1 inch thick per four caster levels
Which, unless you're CL 480, also doesn't meet that 10' minimum.
Wall of Thorns is a little less bad, labelled '(S)', but also saying:
You can make the wall as thin as 5 feet thick, which allows you to shape the wall as a number of 10-by-10-by-5-foot blocks equal to twice your caster level. This has no effect on the damage dealt by the thorns, but any creature attempting to break through takes that much less time to force its way through the barrier.
Which seems like a pretty clear 'specific-exception-to-a-general-rule' thing.
Wall of Lava is also shapeable, and is as thin as a wall of stone.
I'm a little bit confused about these spells. Which of them are actual exceptions to that 'you can't make it thinner than 10' ' rule? If any of them aren't, what are you supposed to do about that '(S)' in the description?