Orange pauldron indicates that that this stormtrooper is a commander. I believe that this is the highest pauldron rank. They appear in star wars rebels only however a sandtrooper wears a orange pauldron in a New hope and the upcoming Rogue one. Stormtrooper sergeant
Estuaries are also in the littoral zone. The littoral zone is the part of a sea, lake or river that is close to the shore. In coastal environments the littoral zone extends from the high water mark, which is rarely inundated, to shoreline areas that are permanently submerged.
The ocean can be divided from its surface to its depth into three zones based on the amount of light received. 1. Sunlit Zone: This is the top layer, nearest the surface. It is also called the euphotic zone. Here there is enough light penetrating the water to support photosynthesis.