It was named for the limestone bed of the Johnson Creek which flows through the area.

It was found in a limestone bed that was a few hundred thousand years younger than the other finds.

The Otonabee looks black, from the dark limestone bed over which it foams and rushes.

It is also possible to find ball-and-pillows in limestone beds that overlie shale, but it's less common.

It is a wide river that cuts into limestone beds.

For about one hundred million years this limestone bed lay flat, sometimes exposed but usually at the bottom of some sea.

From there the shaft probably followed the limestone bed on a down% yard slope.

The white color is caused by the lake's limestone bed.

Then, around 170 million years ago, the limestone beds were thrust upwards.

Marine fossils (bivalves and ammonites) may be found within some of the limestone beds.