A 2008 geological study cast doubt on the tunnel's practicality.

The company commenced also geological study of the site.

He began painting at the age of twenty, during his geological studies.

Recent geological studies project the rate of sinking to be around two inches per year.

During the following few decades, increasing numbers of visiting scientists brought an increased emphasis on biological and geological studies.

Although the first geological studies were undertaken in 1892, iron mining did not begin until the 1950s.

The location also allowed him to make geological studies in the adjoining region.

What changed in the later 20th century is the perspective of geological study.

Rather he had somehow heard of the scientific possibilities-the first geological studies were made before 1860.

The first large-scale geological study of the area was conducted in 1945-1948.