

The bone is on a stone and it can be difficult to locate without Eagle Eye. Follow the dried-up river and you will eventually reach its end. The sixth dinosaur bone is not too far from bone number two. Climb down the ladder found near the platform to find the bone. The fifth dinosaur bone is found under the Oil Derrick that's just south of the "R" in Heartlands on the map. The bone is difficult to spot as it's stuck in the ground, so Eagle Eye is extremely helpful in this case. It's in a spot to the south of the gap between the "R" and "T" in Heartlands on the map, a little to the north of the bend in the road to the south. The fourth dinosaur bone is not too far from the third one.

If you follow the train tracks from the station, you can find the bone by going a little to the north when to the south of the "A" in Heartlands. It's located to the west of Flatneck Station, directly to the south of the "A" in Heartlands on the map. The third dinosaur bone is close to the Lemoyne area like the first two. The bones are found at the edge of the dried up river. It's located to the north of the "L" in Lemoyne on the map, to the west of Dewberry Creek. The second dinosaur bone is not too far from the first one. The bones may be out of view due to the grass, so make sure to use Eagle Eye to highlight them. The first dinosaur bone can be found to the very south of the "L" in Lemoyne on the map. He will also receive a final reward, the Jaw Bone Knife. By heading there, Arthur will witness the dinosaur skeleton recreated in all its glory. The letter is an invitation to her current location, which is close to Cumberland Forest near Valentine.

Once all thirty locations have been revealed, you have to let 24 in-game hours pass, head over to any post office again to receive Deborah's letter. To do so, you simply need to head over any post office and interact with the clerk at the counter to send a letter to Deborah with the location. Simply finding the dinosaur bones is not enough to complete the mission, as Arthur has to mail the location of all the bones to Deborah. The mission can be initiated at any time after Chapter 2, but can only be completed fully after the story has also been finished, as the final 8 bones are located in New Austin, which cannot be accessed in any way before the end of the game. By interacting with her, Arthur will learn of the dinosaur bones scattered all over the world and of the woman's request, which is to help her locate 30 of them. She can be found in The Heartlands in New Hanover, a little to the south of the "H" in Heartlands on the map. The "A Test of Faith" mission begins when Arthur meets Deborah MacGuiness, an amateur Paleontologist.
