In this /r/worldnews submission, user /u/getlaidanddie linked to a blog post describing a trip around the Aral Sea taken by a friend.

In the second part of the blog post, they come across burial stones that supposedly belonged to nomadic tribes from the area. Some of the stones have what appear to be pretty basic symbols and the post author suggests that that might indicate the tribal affiliation of the deceased.

Then there's another headstone engraved with what appears to be Arabic writing, and the author suggests that

If the script is Arabic, then it could be written in Karakalpak language as it was based on Arabic script until 1928

My question, beyond just trying to get any resident expert to talk about the history of these sites and the people who created them, is about the use of a graveyard -- if the Arabic script stones represent a different culture from the more 'simply' engraved ones, does that suggest that a burial site was reused by non-contemporaneous civilizations? In the context of the steppes, where you'd figure there's plenty of space, and you wouldn't have to bury your people next to other people if you had religious qualms about it, does that mean these people didn't have religious qualms about it?

Or is the basic assumption wrong and these were all the same people and the difference in the headstones is due to some other reason?

Here are links to all the relevant images from the blog post

Image 1 | Image 2 | Image 3 | Image 4 | Image 5 | Image 6 | Image 7

"Arabic" Image 1 | "Arabic" Image 2 | "Arabic" Image 3 | "Arabic" Image 4

Link to Part 1 of the post, if anyone is interested

If the sub rules require me to ask a clearer question -- what were the determinants of a common burial location for a people/culture who did not live in any one place?

Thanks in advance for any responses.