“…Many investigators determined that the Egret Member of the Rankin Formation is the principal source rock of the Jeanne d'Arc petroleum province (Swift and Williams, 1980;Powell, 1985;Creaney and Allison, 1987;von der Dick, 1989;von der Dick et al, 1989;Bell and Campbell, 1990;Williamson, 1992;Huang et al, 1994Huang et al, , 1996Fowler and McAlpine, 1994;Prokoph and Agterberg, 2000). (C) Size of each discovery decreases between each third (by order of discovery) and within each third.…”