David became relatively independent and spent his time in geological investigations.

Then they agreed to start geological investigations at the site in 1964.

The project was first considered in 1965 and in 1975 geological investigations were carried out.

The detailed geological investigation of the area, to choose the most suitable site for the dams, started immediately.

During archaeological and geological investigations scholars found a fallen monolith, which even on its side rose 6ft from the ground.

He died during the geological investigation of a new railway line in Anatolia.

The exposed surfaces, they said, may make the rover's geological investigations easier.

Or, perhaps," he added, "Professor Smith and his friend wish to continue their geological investigations.

During this time, he conducted geological investigations in various parts of Europe.

Every year he presented a Summary of the geological investigations made by his staff.