In the centre of a pumice-covered plateau from loon to 2000 ft. In 1886 there was a serious volcanic eruption in the outlying island of Nivafoou, and at the same time Falcon Reef, normally awash at high water, discharged sufficient scoriae and pumice to form a new island 50 ft.
The superior facet, also called the superior articular process, is a pair of facet joints between pairs of vertebrae. A facet joint is what holds two vertebrae together and each vertebra contains two pairs, an upper-facing superior facet pair and a lower-facing inferior facet pair.
1 As this anterior gliding occurs, the head of the mandible rotates on the inferior surface of the articular disc. 2  This permits simple chewing or grinding movements over a small range. 3  Movements that are seen in this joint are: depression, elevation, protrusion, retraction and grinding.