Bearded Geology

While between rain storms earlier this week, I was able to get out into the field to do some outcrop work near Yellville, Marion County, Arkansas. I visited a roadcut near the US Hwy 412/AR Hwy 125 junction that is made of Lower Ordovician age  dolostone rock with some shale intervals. Interestingly, it has a couple thrust (reverse) faults on display: Thrust fault through carbonate rock (Facing north. Scale: 1.5 m staff with 10 cm intervals) A closer look at the fault in the lower-right corner of the previous image An even closer look at the fault. Lots of fault gouge. Notice the clasts that have rotated. Another thrust fault at the same roadcut (Facing north. Scale: 1.5 m staff) Some weeks ago, I was visiting a roadcut near Cotter, Arkansas  where I left with buckets of samples to analyze. One such sample was a large cobble that I slabbed on the rock saw and found these beautiful normal faults, with a baby graben flanked by two horsts: Faulted rock wi

Recent earthquake (orange dot) on Sept. 12, 2019 (via  USGS ) After a slow start with my research, I'm hoping that things will begin to move along much faster this fall. To help with the momentum, I've scheduled a meeting with my PhD committee, however, the best day to do so is tomorrow - Friday the 13th. Now, I'm not a superstitious person. After all, when has anything bad happened to me on Friday the 13th? I'll take my chances. However, early this morning - at 1:42am for those who are sticklers for precision - I had just woken up as I was rolling over in bed when suddenly an earthquake rumbled through. I heard my window blinds rattle and felt my bed vibrate, which brought me into a state of sleepy confusion unsure if it was an earthquake or just my neighbors on the other side of my wall. It was initially recorded as a 3.7 by the USGS with an epicenter 19 km (11.8 miles) south-southeast of Gassville, Arkansas just east of the Buffalo River in Baxter County. On

Measuring section and bagging samples in Marion County, Arkansas looking for clues from the Ordovician in some cherty dolostones. When you can't find a Jacob's staff in the office, you grab a broom stick and make your own...with black, semi-goth duck tape! Now to figure out how to cut slabs, make thin sections, and make sense of these weird tan lines.

While researching dolomite, I read this delightful bit in the journal AAPG Bulletin : "Furthermore, the feasibility of this, or a similar system was recently demonstrated (unintentionally) by a male dalmatian who produced uroliths [essentially kidney stones of the bladder] of ordered dolomite in his urinary bladder." That is a sentence that I never thought I would read in a highly respected geologic research journal. Previously, I would have thought that a dalmatian would exclusively be a subject in either a medical or biological study, not a geological study. I stand corrected. This also raises a series of questions: (1) Was this the author's dalmatian? If not, who's dog was this? (2) What provoked a geologist to look at the uroliths, especially if it was from someone else's dog? (3) How did someone find the stones? Did someone wait for the uroliths to pass, did someone dig around outside (or inside!) in a puddle of pee, or were they retrieved via surg