Figure 3. Interactive polygon reduced (from 3 million to 50,000 polygons) VRML model of a juvenile Tylosaurus sp. basisphenoid-basioccipital. The overall length of the fossil is 113 mm.

Author's note: The preferred method for viewing the three-dimensional model is with Virtual Reality Modeling Language (VRML) software. However, as the VRML model is a large download (15 MB), is extremely demanding on desktop computers, and it requires a fast computer (minimum 400 MHz Pentium II (or equivalent) or a G3 processor, 64 MB RAM, and 8 MB of video RAM), a QuickTime VR version is provided. Viewing the VRML requires a VRML plug-in a format that is more fully supported on PCs than Apple Macintosh computers.  The recommended VRML plug-in for Macintosh is WorldView from Intervista or the Macintosh version of the Cortona VRML plugin from Parallel Graphics. PC users should use the PC version of the Cortona plugin.