Abstract
Numerous features are described, and several models of flows are outlined. The Littlefield Rhyolite flows in Oregon are an example of flows which have spread out over an open surface; the poles of flow layers in a small domain, plotted on an equal area net, fall in a partial girdle which defines a vertical great circle, with a maximum in the down-flow quadrant. The Watchman flow at Crater Lake is an example of a flow confined to a valley, the pi S girdle is diffuse. The Llao Rock flow at Crater Lake is transitional, in that it filled a valley and then spilled out into the open. The geometry of flow layering in the rhyolite at Owyhee Dam corroborates the location of the conduit based on field evidence and indicates the utility of this type of study for determining direction of movement.
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