uncrossed - ussingite
- uniformity
- uniformly dipping beds
- uniformly folded
- uniformly loaded
- uniformly magnetized body
- uniformly magnetized layer
- uniformly magnetized rock
- unigeneric
- unijunction
- unilateral
- unilobite
- unilocular
- unilocular foraminifer
- uninodal
- uninterrupted production
- uninterrupted reflections
- uninvaded zone
- uniplicate
- unique feature
- unique interpretation