Geologic Map of North America, 2005 (7000 × 6798)

• Map key (and split map copy): “Back Matter” PDF (19 MB) from the map + article at geoscienceworld.org

• Text explanation in article without map at USGS.gov (see page 7 of 28)

Unfortunately, I cannot find a non-rasterized digital version even though the original clearly was a digitally typeset document.

It's kinda cool despite that.

Could be cool but who knows without a key to read it.

Is there a key?