Log significant changes we’re told, but what does “significant” mean when logging a hole? It’s Ask Brock 223.

Drillers can now perform logging on their own with a new generation of portable equipment that operates from their PC.

The groundwater level indicator can operate in crooked wells or wells drilled at angles.

The Explorer operates at depths to 1,200 feet in 2- to 12-inch-diameter boreholes.

Let's say that someone created a set of borehole logs. Now, they want to arrange them spatially so that they can see how their geologic layers correspond.