Carbon deposits in oil screen?, Something I have not seen before with this engine. Options

[mgphoto]

Hello,
I had one of the messiest oil changes today. I raised the car up about 15 inches off the ground and just as I loosen the oil screen fastener the wind picks up and starts to blow the oil past my collection container! OK I reposition the container with oil still dripping down the sides!
The mess aside, my concern is what I found in the oil screen, a good number of carbon bits, some big 1/8 inch diameter most small, a bit larger than grains of sand.

I cleaned the screen and removed all of the carbon and changed the oil using Brad Penn high performance oil (the green oil). I had been using Castol GTX, I had a couple of cases of the old stuff in the garage, ran out about a year ago and bought the new stuff and started reading about the changes in formulation.
Could this be the cause of the carbon or is something else happening inside my engine?

Oh, and more of the mess, I put some fresh oil in the filter, as I was installing it, I was distracted and yea, I tilled the filter and spilled a few ounces of oil down my sleeve.

I am lucky I keep a big bag of cat litter around and we don't have a cat!
Thanks for looking.
Mike