Magnified Pictures of Pressure Vs Percussion Flakes

This link is a picture that shows the uniform "rippling" effect of the compression rings on one of dads blades. Although, you can not tell from the picture since it is so magnified, but that flake is actually over 1 inch long and nearly 1 inch wide.(the size most associate with percussion flakes)

http://www.modern-flintknapping.com/sweetwater_blade_replica_2.html

This link is a picture of two flakes side by side on the Sweetwater cast, the one on the right we believe is a pressure flake and the one on the left is a percussion flake. We actually have better pictures of other pressure flakes from the Sweetwater that show this rippling effect of the compression rings in more detail. But we thought this one would make for easy comparison.

http://www.modern-flintknapping.com/sweetwater_blade_replica_3.html

If you click on the pictures once you go to these links, you can enlarge the pictures even more.