I found clay, now what

Hello everyone! So, I dug down about 4 ft of soil before I struck a hard layer of clay yesterday, I'm so thrilled
This means that I hopefully can build my house with this material.
I used a digger, but I quickly discovered that this layer was very hard to dig into ( I used a digger).
I took out a sample, rolled it easily into a thin worm, and it's very sticky.
I tried to do a shake test in a jar, but it's very cold and I had problems with the clay not dissolving very easily,  but I am convinced it's a very high clay percentage in this.

My main question to you, is how do I utilize this the best way? Do I dig it up, use it as plaster as is? It seems very compact, so are there some tricks to make it more workable?  

Thanks for all the input

you are very lucky I have to go at least four inches before I strike clay :-)

I am assuming this is dry clay.  That said, if I were you, I would consider how much of this clay you need, then remove the top soil layer from as many square feet as you need. Put the top soil in your garden. Now dig a trench line though the clay about a foot deep.  This should make it easier for you to break the clay out in chunks, pulverize it in the trench, remove it with a shovel, and store it until you want to re-hydrate it and then you can do whatever you want with it.  It's a lot of work, but I really recommend working the clay out of the ground while it's dry, especially if you have to tote it any considerable distance.