Outside the Interzone
Outside the Interzone 's Latest Posts
Though I've not really mentioned it much, if at all, secondary calcite is present in abundance in this outcrop, forming especially in joints which then break open and reveal the patches. Above the hammer is another example, where it's forming a flattened plate within the sheared mudstone. Above and below the mudstone are coarser, sandy layers.Photo unmodified. May 7, 2013. FlashEarth location.
A couple of other geobloggers chimed in yesterday on that pestiferous fold. Callan Bently offered this annotation "as my attempt at generating a hypothesis that I'd prefer to test on the site itself... :)" Indeed. More to be said on that in a moment. In essence, he has recognized that the larger pattern around the small, tight recumbent fold involves a surrounding sandy layer, which in turn is surrounded by a coarser, conglomeratic layer of variable thickness. I was struggling trying to make […]
...timey-wimey. Whatever. That fold is still making my brain hurt.Photos converted to .gifs in Paint.Net, stitched in HugIn. May 7, 2013. FlashEarth location.
Sometime after I got home last night, it occurred to me, despite my comment yesterday, "I see no other supporting evidence for this supposed fault..." that Dana and I had spent a few minutes at another portion of the outcrop, to the east (inland/down section), looking at shearing in a mud/siltstone bed. The clues I'm looking at here are the pervasive joints in the finer bed terminating in the lower left corner of the photo, which in this tilted sequence are vertical. But with respect to the […]
I have to admit, I didn't see this until I started looking at the photo this morning. I missed it at the outcrop where I might have looked for clues more carefully. On top of that, I neglected to get some mid-range photos, between today's close-up and Thursday's distant shot, so unless I get back to this spot, and can find this structure again, as far as I can tell, the problem is insoluble.Do you see it? Check below for an annotation of the fold that has been tormenting me for several hours […]
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