We have developed an argument and evidence from our experiences for the utility of 3D virtual reality (3DVR) systems in the interpretation of 3D geologic data. Interpretation of 3D data by geoscientists is performed in “the mind.” Visualization of 3D data in 3DVR environments is an efficient method of getting the data into the mind. Descriptions of visualization and interpretation of several different geologic data sets in 3DVR environments illustrate the advantages of 3DVR. Despite the advantages of visualization in 3DVR, several reasons exist for the present limited use of 3DVR by geoscientists. With the relatively recent availability and affordability of smaller hardware and software systems, we believe 3DVR should become commonplace on the desktops of geoscience interpreters.