What are layers of rock with unconnected pores called?

Shales are examples of rock layers that have many unconnected pores. In Geology, pore space is called porosity and connectivity of pores is called permeability. Shales have high porosity and low permeability.|||Have you looked at sedimentary rocks? They are found in all kinds of places. Go to the beach or a river who cuts down through the layers. I have never quite understood why each Layer changes throughout time: but it does. And each level of rock that shows a change is important. Now if only I had access to something that could tell me which direction the poles were in when this changed...can only be told by the gas trapped in that sediment, and the direction that the little black rocks hold in the polar direction..I could tell if these rocks were layered down softly or hardly..in line with the poles.


OR, you could ask the rocks themselves...be a bit strange, yet everything in existence is determined by rocks...your brain included..the rocks will tell you much...