Andrew's Geology Blog has updated his online compilation of geologic maps for all 50 states that he started 10 years ago. He's "using larger images and a brief introduction to the geology of each state."
The maps are posted on the About.com/Geology website.
I've heard from a few of my fellow state geologists that there are newer versions of their state maps (e.g. Iowa, Ohio) but Andrew says this is the only national compilation of geologic maps. I can imagine that some of us will be sending him the newer versions we have.
[right, geologic map of Arizona from the USGS]
Earth is not Venus
8 hours ago
While it is a great resource, the maps of many states appear to be enlarged versions from the DNAG Tectonic Map / Geologic Map of North America... and an outdated one at that...
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