These are typically arranged in a triangular formation just forward of an area of the head known as the vertex.

These basalts are part of a larger volcanic formation known as the Chilcotin Group.

The field was discovered in a geological formation known as the Pre-salt layer.

This recalls the defensive formation known as the "Hollow Square."

It was drilled in the formation known as the Hatfield Basin.

It was part of the European formation known as Canadian Forces Europe.

This refers to a prominent geological formation known as "Tablerocks" at the western end of the city.

The cave is also noted for a high incidence of the peculiar formations known as Helictites.

A brief summary of alternative formations known to have been used is shown below:

This is the first recorded instance of the military formation later known as the oblique order.