This is a fascinating find.
And one of the dates involved is of particular interest, from my point of view:
http://news.nationalgeographic.com/2015/07/150724-Maya-hieroglyph-shrine-Tikal-Calakmul-Guatemala-archaeology-stele-discovery-Peten-epigraphy/
Thanks to Zander Sturgill for bringing the article to my notice.
Posted from Logan, Utah