Uncovering Ancient Landscapes of the Rio de Flag. A walk with Richard Holm, NAU Professor Emeritus

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Thursday July 11, 2019. 6:00 pm

We will meet at the SW corner of the Sams Club parking lot and walk down South Babbitt Drive to the Rio de Flag near the treatment plant. From there we will head downstream past the I-40 wetlands
and continue towards the Little America property. Wear comfortable walking shoes and be prepared to walk approximately 3 miles

Our walk will explore the ancient landscapes of Flagstaff visible from the FUTS trail along the Rio de Flag. Richard Holm will show how lava flowed down and filled small canyons. Later floods re-excavated the drainages where the trail is now located. He will demonstrate field evidence for reversal of flow.


Richard Holm is the author of the recent publication from the Arizona Geological Survey pictured above. The walk will encompass Trail 2, stops 6-8 described in the publication. This work can be downloaded for free by clicking on the link below.
http://repository.azgs.az.gov/uri_gin/azgs/dlio/1915
Hike with geologist Richard Holm, looking at geologic history of the Rio de Flag