“…References : Foster and Chapman, 1967;andFoster, 1968a and1968b. References : Overbeck, 1918, p. 183-184;Joesting, 1942, p. 17-20;Cobb, 1967, p. 239-240 and1973, p. 174-176;Foster and Chapman, 1967;Foster, 1968aFoster, , 1968bFoster, , and 1969Cathrall and others, 1987;Loney and Himmelberg, 1988;Foley and others, 1989;Patton and others, 1989, p.12-13;and unpublished Bureau of Mines data.…”