Finding the inert samples in Marathon can be maddening, as their possible spawns are all over Dire Marsh and tend to be in or around high-traffic areas. If you want to complete the Selection Pressures ...
After talking to your father at the Azuria Castle, head west to find the exit. Next, talk to others and call your Monstie (R on the keyboard/Square on the PS5) to mount it. Proceed northwest for a bit ...