A detailed field examination of an area between Plymouth and Rochester, Vermont, on the east side of the Green Mountain range was made in an attempt to locate the root zone of the Taconic thrust fault. Evidence was found that the roots of the thrust do not outcrop in the area studied. The discordant relationships of the Green Mountain sequence to the marbles of the Rutland valley suggest that the fault lies a short distance east of the marble belt. The Green Mountain sequence in this latitude appears to form an eastward-dipping homocline rather than an anticline as previously thought. A minimum figure of 14,000 feet is estimated for the stratigraphic thickness of the Green Mountain sequence.