Another great week in the field! Temperatures are coming down some which makes things much more bearable. Monday we came down from Fox and crossed the Middle Fork at Lydalisk. Went as far south on the old railroad grade as we could then worked our way back, getting points along the way. Still finding the Imo near the bottom of the valley. The river was so low that we could actually cross it on foot to get a drainage on the east side. The first good outcrops we found there were the lower Cane Hill. There were good examples of taphoni in the rocks there. Commonly known as “honeycomb weathering”, taphoni is caused by weathering processes in many rock types and under many conditions. In the Cane Hill it typically affects the thin-bedded sandstones in dry areas beneath overhangs and is probably due to differential dissolutioning of the cement by groundwater. This process also causes the concave structures as noted in previous blogs.
The next two days we started at the upper end of Indian Creek and worked our way down. Lots of Fayetteville shale production going on in this area, which means good roads for us! Seemed to be in Witts Springs sandstone the entire stretch, so not a lot of contacts. Definitely had a lot of dipping rock and signs of a large fault further south including deformation bands and non-vertical joints. Located a couple small faults with what we think is minimal offset along the creek and adjacent hollows.
Did have a few encounters with our reptile friends. We always leave them be so maybe word will spread among their kind that we mean no harm. It’s worked so far!
See you on the outcrop!
Snake count: 2
Tick attacks: severe