Five minutes after this photo, the sky turned deep black over our house
We are just 1/2 mile from center of town, shown here, but cannot see horizon because of all the trees around the place.
Had a very loud intense storm from this a few minutes after the pic was taken.
I found the pic on Twitter later that evening.
Some of you may recognize the white dome of the courthouse at the edge of the big red brick building.
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This one isn't a wall cloud. Shelf clouds are longer and appear toward the front edge of a storm. These are non-tornadic whereas a wall cloud has potential to produce tornadoes. 
Just meteorology. Definitely give it a Google. Unfortunately, my phone refuses to copy and paste, but there are some great pages out there detailing the different parts of a storm cell.....including other fun clouds like scud and inflow bands (both mistaken for tornadoes). There are also some pretty good YouTube videos that explain the difference between the two. Google images for "shelf cloud" will give you identical pictures to this. Wall clouds are less sexy (no offense to wall clouds).
And I will shut up now because I realize I talk too much about weather. 
I didn't doubt you just didn't know and my thanks to you was sincere because I like to learn.
The photos I found shows the difference, just as you said.
Thanks again, I will do those things you suggest to learn more. We don't have a lot of thunder storms so I don't get as much practice as I'd like. I'm one of those people that enjoys a good storm.
You can never talk too much about weather as far as I'm concerned.
Thanks again! 
I am glad you found some good explanations.
I live in PA so we have plenty of storms. I was terrified of thunderstorms as a teenager, so I began studying them intently in order to understand them more and reduce my fears.
The internet is a valuable resource for weather geekery.
That is an impressive, and scary, looking cloud.
