P.E. Raymond of Harvard called it "the oldest coral reef in the world" (Raymond 1924), though coral rubble was not in fact the primary reef building material.
Percy E. Raymond, "The Trilobites of the Chazy Limestone", Annals of the Carenegie Museum 3.2 (1905): "...the forty years which have elapsed since the distinguished Canadian paleontologist, Elkanah Billings, published his descriptions of Chazy fossils".
H. J. Hofmann, "Ordovician Chazy Group in southern Quebec" AAPG Bulletin 47.2 (February 1963:270-301) retrieved November 30, 2008 http://aapgbull.geoscienceworld.org/cgi/content/abstract/47/2/270
The quarrymen's term was noted by Raymond 1905.
The blackest stone may be seen in the polished "marble" revetments—actually unmetamorphosed limestone— inside Radio City Music Hall, New York, and in floors in the Vermont State House. /wiki/Limestone
"Chazy Fossil Reef". National Natural Landmarks Program. National Park Service. June 28, 2012. Retrieved September 16, 2016. http://www.nature.nps.gov/nnl/site.cfm?Site=CHFO-VT