jointage

At one place was a fine display of basaltic columns, the position of which was horizontal, the flow having come up as a sheet injected from below, and not as a surface out-flow, where the jointage would have been vertical.

In Indian Mexico (1908) Frederick Starr 1895

So closely are the individual pieces fitted to each other that at a little distance no jointage appears, and the wall bears every indication of being a plain, solid surface. "

The Prehistoric World; or, Vanished races Emory Adams Allen