I don't find a tutorial, the link just goes to a bunch of links. Thanks for sharing though!
Shame no link to tutorial as looks like a great block.
I performed a google search and came up with http://www.patchworksquare.com/mf/tonganoxie-quilt-block.pdf among other instructions for this quilt block. Hope this helps.
Found the instructions by Amanda Jennings for this exact block at:http://web.archive.org/web/20110415014338/http:/www.patchworksquared.com/2011/04/p2-modern-solids-quilt-along-week-2.html