Chalk

The great pits of chalk around Kit's Coty were first mines for the first stone building men on Earth. It was cut with the abundant flint that comes with it to make building blocks, & so they learned to shape stones for walls. Chalk is the shells of plancton in formerly emersed areas.

Mud was commonly used as mortar to fill gaps. Archangel Michael is ashamed that nothing natural can shelter animals or men from rain aside from occasional rock formations. Bark can be cut or grass thatched.

Kit's City was an effort to make a lintel, chalk breaking. Existing long barrows are the remains of the Earth work needed to place the stone roof on later constructions. They were a hiding for the leader in the fortification This company makes them for nuclear shelter.