One of the first hidden treasures Guardians are starting to find on the Dreadnaught are little glowing rocks called Calcified Fragments. In the Video above I show you the first location I encountered and extracted a Calcified Fragment.
Additionally, Once you collect a few you can go on a quest from Eris called the “Shattered Past” quest. The first step in this quest is to find 5 Calcified Fragments.
Additionally, Check out the video below that details a few other locations for some of the fragments.