Well, Somaliland has been closed to outsiders, and still is closed to outsiders.
For some reason archaeologists from Western Universities are adverse to threat of decapitation in their quest to discover previously undocumented ancient sites.
This has not always been true. In the late 19th and early 20th centuries Italy and Britain controlled what is today Somalia.
The point I was making is that this article describes a confluence of ground breaking discoveries that it just too unlikely in their number and importance not to raise suspition in anyone who remembers the story of Piltdown Man
Archaeologists will typically color them in with chalk so you can see them better.
Frankly, finding a horse at about 4,000 BC ~ with a man mounted on it ~ makes a lot of sense. Much older than that and I'd expect to see a couple of horses pulling a chariot, or maybe a small horse on a spit being roasted for dinner.
Anyway, the horse, with men, should have been moving South into East Africa about then ~ on a permanent basis.
Earlier you'd had a stray Egyptian exploratory group possibly ~ but that'd been pretty expensive for them.
The man is "the white man" and he is bringing his "burden" on horseback ~ plus, he has a whole load of genes he's going to spread around and screw up all those people looking at y chromosomes. The mtDNA is a local product ~ it'll stay the same!
Somaliland is a former British colony that was merged with a former Italian colony to create Somalia. About 20 years ago it broke away and has become a defacto independent state although it is not recognized by any other nations. It is safer than Somalia to the south, but would fit in the adventure travel category.