A carbonatite body of approximately 6x2 km elongated northeast- southwest is intruded into granite gneiss along the Grenville Front. The carbonatite is a coarse grained black, massive rock of green pyroxene, red-brown biotite, magnetite, pyrite and a little apatite. Spectrochemical analyses gave 0.56% SrO, 0.14% BaO, 0.13% CeO and 0.13% LaO.
CHARBONNEAU, B.W. 1973. A Grenville Front magnetic anomaly in the Megiscane Lake area, Quebec. Paper, Geological Survey of Canada, 73-29: 1-20.
WANLESS, R.K., STEVENS, R.D., LACHANCE, G.R. and DELABIO, R.N. 1972. Age determinations and geological studies: K-Ar isotopic ages, Report 10. Paper, Geological Survey of Canada, 71-2: 1-96.