I’ll be posting #FridayFold photos on my blog rather than doing it exclusively on Twitter or Mastodon. I will then refer to these articles from my social media accounts. Remember: Make a blog; control your content.
Almost 12 years ago I attended a geology fieldtrip around Galicia, as part of the the DRT 2011 Meeting* that took place in Oviedo (Asturias), my alma mater university. One of the stops was at the harbour and beach of the small town of Burela (Galicia), where we saw some spectacular folds.
What you see in the photo above is a couple of antiforms (and a synform in between) in the shape of a drunk M falling to the left. These are described as tight folds, overturned and vergent to the east. They developed in sandstones and sandy metapelites of the lower part of the Cándana Group (lower Cambrian). The folding occurs as part of the Variscan orogeny.
The next photo shows a larger fold, same type and same rocks as above, but in here we can see boudins that have been shortened and thickened during compression.
Until next #FridayFold!
*DRT: Deformation mechanics, rheology and tectonics.