"The Great Train Robbery" side missions

So I Googled where to find the bone samples and Diamondbacks. It'd seem there's only one thread on the internet asking about this. There was pretty helpful information on the location of the Diamondbacks, but nothing very specific, enough for me to find them though. However all I get as for the locations of the bone samples is that they glow on your minimap. Well that's not the case for me, at least not for the third bone sample. The first two glow on my minimap, but even with my eyes an inch away from the screen I can't see anymore glowing dots anywhere. So could anyone say specifically where the bone samples are?

 

The bone samples only show up on the minimap when you've uncovered the fog of war covering them. One is directly to the bottom of the base, around the lower left edge. One is kind of north and west of the base by a little bit. Can't remember where the third one is though. They are a lot easier to find, or should be, than the diamonbacks, at least thats how it was for me.

 

Just explore around a little bit more. Search for places still covered in fog of war and send a few units over to check it out.