7
   

Black soot like coating layered amongst sediment

 
 
Reply Fri 25 Jan, 2013 03:06 pm
We are in southern New Mexico in some foothills around the Rio Grande. About 8 feet below the surface of some folded sediment, we found rocks covered in a black soot like material. The layer was about a foot deep. Upon further digging, we found another layer about 6 inches deep. The material will rub from the rocks. I have a picture but have no idea how to post them here. Any ideas? We were thinking fire that leached or possible decayed biological matter.
 
Region Philbis
 
  1  
Reply Fri 25 Jan, 2013 03:09 pm
@martybaston,
Quote:
I have a picture but have no idea how to post them here
upload it to a hosting site, ie photobucket.
use [img] tags.
make sure the picture is visible by previewing before you post it...
dalehileman
 
  -1  
Reply Fri 25 Jan, 2013 04:32 pm
@Region Philbis,
Phil, this somewhat OT but I commiserate with Marty inasmuch as it ought to be easier to post a photo, simply copy-paste, eg as in an email to an acquaintance

Marty, hang in there, you might hear from another rockhound or two like Farmer. Meantime you say it will rub off so is it a black rock and if so well consolidated or powdery, is it smooth or sandy or is any of it glassy, does it contain smaller rocks, how does it smell, etc. But if it's soot-like does it leave a streak on the hand, so could it be charcoal
martybaston
 
  1  
Reply Fri 25 Jan, 2013 05:15 pm
@dalehileman,
Charcoal was my first thought; the rocks are of various types, not black. Quartz, Chert, granite and others in sediment layers. It will leave a streak on your hand. It would have to be from ancient fires as it is pretty deep in the sediment. I will try the pics.
dalehileman
 
  -1  
Reply Fri 25 Jan, 2013 05:23 pm
@martybaston,
Quote:
I will try the pics
Always helps, Marty

Let us know how difficult it proves
0 Replies
 
farmerman
 
  3  
Reply Fri 25 Jan, 2013 06:30 pm
@martybaston,
Charcoal can form during "Diagenesis" wherein some layers of organic material , like wood from a beach pile f flotsam and driftwood, or flood deposits , or snags in a riverbed, are compressed by the overlying sediments and they slowly "stew' in anoxic conditions. However, there are also another bunch of reasons that this can appear and these are managese dioxide deposits called "wad' and ultra fine black sediments of melanocratic (dark colored) minerals like diopside, titanium, spinel, magnetite and uraninite.
usually the latter are slightly more coarser grained.

I need to see the context to provide an opinion as to whether its any one of the above (or something else entirely)

P Dale, Im a rocknocker, not a rockhound. My title takes 3 degrees and years of work in the mines. A rockhound isa hobbyist who usually quits thinking about his rock hunting trip after he has his
first beer. A rocknocker thinks about how he can invoice somebody on it
Ceili
 
  1  
Reply Fri 25 Jan, 2013 11:09 pm
@martybaston,
There is a river here that has a smoking riverbank. It called smoky river... There are seams of coal running throughout the cliff sides and the seams were ignited by lightening or forrest fires long, long ago.
Just a stab in the dark. I defer to anything farmerman says on the subject.
farmerman
 
  1  
Reply Sat 26 Jan, 2013 06:29 am
@Ceili,
could be that too. Pics say a thosand words
0 Replies
 
dalehileman
 
  0  
Reply Sat 26 Jan, 2013 12:11 pm
@farmerman,
Quote:
Dale, Im a rocknocker, not a rockhound.

Thanks for that term, Farm. It's not everyday……..
http://www.google.com/#hl=en&sugexp=les%3B&gs_rn=1&gs_ri=hp&gs_mss=definerocknocker&pq=rocknocker&cp=7&gs_id=41&xhr=t&q=define+rocknocker&es_nrs=true&pf=p&tbo=d&sclient=psy-ab&oq=define+rocknocker&gs_l=&pbx=1&bav=on.2,or.r_gc.r_pw.r_qf.&bvm=bv.41524429,d.cGE&fp=171f1ce03d5b6aef&biw=1411&bih=753

http://onelook.com/?w=nock&ls=a

Quote:
My title takes 3 degrees and years of work in the mines.
If not critically revealing, schooled where (as you obviously speak the most fluent English), where and what was mined, and what exactly did you do down there….

….did you bring any rocks back home and how did you then display them

Quote:
A rockhound is hobbyist who usually quits thinking about his rock hunting trip after he has his first beer.
Carrying a small fridge as semipermanent installation I must have ben the exception as I'd still be at it after the first sixpack. Looking back, what's so appalling, is then I'd drive back home

Quote:
A rocknocker thinks about how he can invoice somebody on it
So rocknocker is a professional geologist who scratches a bill into the surface of a rock
farmerman
 
  2  
Reply Sat 26 Jan, 2013 05:21 pm
@dalehileman,
Myschools were all US colleges and unis with the exception of some small stints at Dalhousie an another Canadaian school where we took a series of long term seminars on limestone deposition.

Much of my mining has been with a few substances like Titanium or rare earths. However, many of my largets contracts ere in finding an assessing reserves of Ca rich kimestones for cement.

Ive done oil and gas, and spend about half my time in assessing environmental damages and water degredation from many types of extraction and mining. Thats one of the reasons I maintain a low profile. Im usually working on a case or two an lawyers love to look at peoples "face book" accounts and
dalehileman
 
  1  
Reply Sun 27 Jan, 2013 12:18 pm
@farmerman,
Thank you Man for that report

I presume that a2k must constitute a much lower profile than Facebook
0 Replies
 
James Marple
 
  1  
Reply Wed 25 Jul, 2018 01:52 am
@martybaston,
Please describe the 'folded sediment' in more detail:
Firm, pliable, brittle, cemented, fines, clay, color?
Holocene, Ice Age, older?
Probable mechanism that folded it?
Near a large elongate depression trending N/S?
[email protected]
farmerman
 
  2  
Reply Wed 25 Jul, 2018 06:59 am
@James Marple,
this thread has seen its fifth birthday with no help from its author (and no pictures either). So whether its a problem in geology or archeology or forestry is still unknown.

Sorry, Id like to see it too.
0 Replies
 
 

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