Resources and tools for concepts in geology
Geologic Timescale
Current GSA Geologic Timescale. Note that Ages are chronostratigraphically defined and do not correlate to biostratigraphic units such as NALMAs.
Timescale Creator
Create custom correlated timescales with this amazing utility. Output in Adobe Illustrator or jpeg formats.
Rick Allmendinger’s Stuff
A professor at Cornell University, Rick Allmendinger provides some great tools for structural geology including a downloadable utility for creating stereonets. Many programs are for OS X.