The figure has been transformed and I would appreciate some feedback if you see a fatal flaw. Things to note

1. Several key anchor points on the profiles have been added. Most were evaluated in the field last summer. Some are based on improved mapping of the lava flows using LiDAR in conjunction with field photographs.

2. Points that didn't substantiate the lowest contacts were removed for clarity.

3. It is true that the Qbr surface is essentially completely flat between RK 65 and 70. This is the core of the Hole in the Ground. Interesting, no?

4. Yes. There is a fault at RK 76. We take pictures of it every time. It appears that this fault, a reverse fault, has uplifted the lower Bogus Lava (Qbrl) stack by 25 meters. This is best borne out by the abrupt, 20+ m jump in the elevation of the basal fluvial gravel that is traceable at the base of the lava from the Greeley Bar area to Birch Creek. What is particularly interesting / enigmatic about this fault offset is that it doesn't appear to influence the Qbr profile in any significant way....thus implying a narrow window of time for fault activity. Thus, some aspects of this are unresolved.

In summary, beginning at RK 71 or so, the river flows into a pervasively faulted area...appropriately known as the 'Owyhee Breaks'. You know it well. It begins at Greeley Bar. The prominent bend at Birch Creek is structurally controlled. Many faults in this area strike N-S. It is complicated and I have not spent enough time there with these types of issues in mind. Thus, the second version of the figure may be the best option for now: