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.
Like a lake, the ocean has a photic zone and anaphotic zone.The area of shore between the high-tide and low-tide lines iscalled the intertidal zone. The area of the ocean from the low-tide line out tothe edge of the continental shelf is the neritic zone.