Water. That is where the material would come from, material carried from the outside into the cave by water. Or by water seeping through the rock around it. Or just by material falling in and moving down the cave by gravity over time. It could then make that first choke tunnel much thinner than it used to be.

Didn't take long for Ham to open his prayer-hole.
http://www.patheos.com/blogs/friendlyat ... mo-naledi/

Fascinating stuff.
Isn't it possible they crawled in there for shelter, or were put there alive for some reason? It seems a stretch to say they buried their dead as far as I can see.

The hole they used to access the cave is really tiny, only a small person can get in there. Which is why they surmised that it was a body dump site.

Mmm, yes. But that near vertical entrance shaft to the actual burial site would have resulted in a pile of bones at the bottom of the shaft, not spread out as they appeared to have been found.
The geology needs to be examined more thoroughly to account for any past shifting strata.

Animavore wrote:Didn't take long for Ham to open his prayer-hole.
http://www.patheos.com/blogs/friendlyat ... mo-naledi/

If that moronic fool continues in this way when any new discovery arises, he will only be contributing to his cult's demise. Idiot!

http://news.nationalgeographic.com/2015/09/150910-human-evolution-change/
Interesting read.