A portion of my grade in my ‘Neanderthals: Fact, Fiction and Fantasy’ class was a sheep butchery using obsidian tools. We created the tools ourselves which were unbelievably sharp (The edges of the volcanic glass tools can actually reach 2 microns which is sharper than a scalpel). It took just over an hour to completely deflesh, disjoint and strip the meat from the animal.
I captured a short video to demonstrate the process. A little warning, you might not want to watch it around meal time, but it is quite fascinating to see how easily the obsidian slices through flesh.