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.
All of the light zones can be found in the oceanic zone. The epipelagic zone is the one closest to the surface and is the best lit. It extends to 200 meters and contains both phytoplankton and zooplankton that can support larger organisms like marine mammals and some types of fish.