Comments on: Friday Field Foto #41: Armored mudball (eroded out) http://clasticdetritus.com/2008/02/08/friday-field-foto-41/ A blog about sedimentary geology. Fri, 25 May 2012 13:01:43 +0000 hourly 1 http://wordpress.com/ By: Friday Field Foto #53: « Clastic Detritus http://clasticdetritus.com/2008/02/08/friday-field-foto-41/#comment-3663 Fri, 30 May 2008 14:28:07 +0000 http://clasticdetritus.wordpress.com/?p=565#comment-3663 [...] in February I posted a geopuzzle Friday Field Foto showing a situation where just the armor was left, but the mud had [...]

]]> By: BrianR http://clasticdetritus.com/2008/02/08/friday-field-foto-41/#comment-3004 Sat, 09 Feb 2008 16:20:31 +0000 http://clasticdetritus.wordpress.com/?p=565#comment-3004 Forgot to mention…the rocks I link to in comment above are not the same as the one in this post…just an example.

]]> By: BrianR http://clasticdetritus.com/2008/02/08/friday-field-foto-41/#comment-3003 Sat, 09 Feb 2008 16:19:33 +0000 http://clasticdetritus.wordpress.com/?p=565#comment-3003 “OK, but what kind of mud would erode out while sand around it remained cemented?”

For this particular feature we obviously don’t have the mud left to look at it. But, there are some preserved armored mudballs in this formation in other spots. It’s just regular ol’ siltstone/shale…ends up eroding a bit faster. In this picture, for example, the finer-grained layers are more recessive whereas the sandstone beds are sticking out.

]]> By: Andrew http://clasticdetritus.com/2008/02/08/friday-field-foto-41/#comment-3001 Sat, 09 Feb 2008 05:47:13 +0000 http://clasticdetritus.wordpress.com/?p=565#comment-3001 Cool cool cool! I love being found wrong. So the whole sequence in this view is pure sand except for the thin, thin shell of pebbles. And I thought there was a whole layer of pebbles behind the front surface.

OK, but what kind of mud would erode out while sand around it remained cemented?

]]> By: Julian http://clasticdetritus.com/2008/02/08/friday-field-foto-41/#comment-2999 Sat, 09 Feb 2008 02:54:33 +0000 http://clasticdetritus.wordpress.com/?p=565#comment-2999 “Armored Mudball” would be a fantastic name for a rock band.
Dave Barry reference and geology pun both equally intended.

]]> By: BrianR http://clasticdetritus.com/2008/02/08/friday-field-foto-41/#comment-2998 Fri, 08 Feb 2008 23:59:52 +0000 http://clasticdetritus.wordpress.com/?p=565#comment-2998 i’ve updated the post with the answer … see above

]]> By: Callan Bentley http://clasticdetritus.com/2008/02/08/friday-field-foto-41/#comment-2996 Fri, 08 Feb 2008 22:14:30 +0000 http://clasticdetritus.wordpress.com/?p=565#comment-2996 How about this: One day, a poor little slug (or jellyfish, or other mucousy creature) gets tumbled down a slope covered in coarse sand. Before it has a chance to recover, a windstorm comes along and buries it in finer-grained, well-sorted sand. As lithification proceeds, the nudibranch (or tadpole, or whatever) decays away, but the coarse sand remains in place.

]]> By: Andrew http://clasticdetritus.com/2008/02/08/friday-field-foto-41/#comment-2995 Fri, 08 Feb 2008 22:13:38 +0000 http://clasticdetritus.wordpress.com/?p=565#comment-2995 …probably from a eumiogeosyncline near a peneplain.

]]> By: BrianR http://clasticdetritus.com/2008/02/08/friday-field-foto-41/#comment-2993 Fri, 08 Feb 2008 21:57:24 +0000 http://clasticdetritus.wordpress.com/?p=565#comment-2993 Andrew … nice, pulling out the term “flysch” … old school. I like that.

]]> By: BrianR http://clasticdetritus.com/2008/02/08/friday-field-foto-41/#comment-2992 Fri, 08 Feb 2008 21:38:28 +0000 http://clasticdetritus.wordpress.com/?p=565#comment-2992 Anybody else? One of the answers above is on the right track…but I’m not gonna say which just yet.

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