Okay here's my guess on the mysterious ridges you're seeing in your slabs. I believe there may be a combination of physics at play. First the saw blade I believe is definitely responsible for the physical ridges -- the close ups you provided show a definite external texture of raised/lowered grooves. The reason I believe the ridges are not exactly concentric and perfect arches as you would expect from a circular saw blade is because the rocks hardness and or surface area. I would expect that the hardness of any stone will not necessarily be perfectly uniform throughout the entire rock.  As the blade cuts into harder or softer areas of the rock, the speed at which the rock moves through the blade would slightly increase or slow down and thus effect the shape and angle of those ridges.  Even if you were to find a rock that was for the most part exactly uniform in hardness throughout I would think that you might still find some warping of those ridges as the blade cut into the thickest part of the rock -- more rock surface area coming in contact with the blade, more friction, and thus affecting the speed.  Now things are getting complicated because you would think that the speed should be constant considering the rock is in a vice and rail system that is supposed to push the rock into the blade at a constant speed.  Well nothing is perfect.  I think things are still slightly warping, slowing down, and flexing as the blade encounters different amounts of friction based on hardness and size (surface area) of rock.

ok, I have deleted all my divergent posts on the mystery "ridges".
Scott, you were exactly right and did a great job explaining your reasoning for assuming that the ridges were saw marks.
Thank you very much, and you can now delete that post as well, if you like.

Just a couple pics to get back on track..........whatever that may be.

All right, this is the last group of pics I'm posting until I get some decent lights!
Maybe it's this cave, but even cavemen had fire!

Anyway, here's some pics of another piece of the Green Fault.

And while doing ground pieces..........

Just want to add a few more slab shots to the Chatham County Lime collection.

Now that one is awesome!  Great work Joe. 

Latest from Chatham County.
Terrible pics, too much light, and I had a small green jade carved bowl on a wooden stand I thought would look good on this piece but couldn't find it and used a larger white marble bowl.
As I was going around the piece for pictures I began to see in the patterns a mirror image of what the earth may have looked like at the time of this rocks formation 5-600 million years ago.
Now that's a heavy rock!

Some more quick pics of the last one, and just like the one before it,
someone saw it unfinished on the workshop table and wanted it like it was.
I had to talk them into letting me get the saw marks out!
I left a lot of this one natural rock. One cut on the left side, one down the middle, base and front.