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geology question: is there a term for these sort of incision marks on river cobbles?

 
Anonymous Coward
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10/15/2020 08:32 PM
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geology question: is there a term for these sort of incision marks on river cobbles?
these seem to be somewhat ubiquitous in these parts despite their otherwise varying mineral compositions and general shapes:

[link to imgur.com (secure)]

[link to imgur.com (secure)]


anyone with a hint?
Thomas Cruciamen

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10/16/2020 07:35 PM
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Re: geology question: is there a term for these sort of incision marks on river cobbles?
Shocked = Impact
Thomas Cruciamen

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10/16/2020 07:36 PM
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Re: geology question: is there a term for these sort of incision marks on river cobbles?
Two things will produce this. Nuclear blast or extraterrestrial impact event.
Thomas Cruciamen

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10/16/2020 07:37 PM
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Re: geology question: is there a term for these sort of incision marks on river cobbles?
If you are in possession of those stones, hold on to them. They are "proof".
Thomas Cruciamen

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10/16/2020 07:38 PM
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Re: geology question: is there a term for these sort of incision marks on river cobbles?
Where is this?
Sentio

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10/16/2020 07:45 PM
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Re: geology question: is there a term for these sort of incision marks on river cobbles?
.


.

Not sure.

I know the glaciers caused lots of scars.

.
Glacial striation?
.

Last Edited by Sentio on 10/16/2020 07:46 PM
Sentio

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10/16/2020 07:48 PM
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Re: geology question: is there a term for these sort of incision marks on river cobbles?
Morraine - “ a mass of rocks and sediment carried down and deposited by a glacier, typically as ridges at its edges or extremity.”

.
Thomas Cruciamen

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10/16/2020 07:55 PM
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Re: geology question: is there a term for these sort of incision marks on river cobbles?
That is shocked stone. You can see where sections of the stone became partially molten and bulged rather than broke. This is the only manner in which a stone broken thusly would ever be fused back together again following such fracturing.
Thomas Cruciamen

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10/16/2020 07:57 PM
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Re: geology question: is there a term for these sort of incision marks on river cobbles?
It may have been carried from the vicinity of a moraine by the resulting melt water pulse from what ever shocked those stones.
Thomas Cruciamen

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10/16/2020 07:58 PM
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Re: geology question: is there a term for these sort of incision marks on river cobbles?
The direction from which the shock wave came can be gleaned from the angular orientation of the fractures on two planes in the instance of the larger of the the two in the images.
Anonymous Coward (OP)
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10/16/2020 09:28 PM
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Re: geology question: is there a term for these sort of incision marks on river cobbles?
oh wow, i totally wasn't expecting any replies after this went to the second page in barely 5mins. thanks for the responses and yes, the surface topography in the north-west of this eastern province is likely as good of an example of a glacial till washout as it gets. i can elaborate on the circumstances further if anyones interested after i do a bit of looking-up on "shocked stone" myself here...that's so concise and accurate of a description for these 5hings that i feel a bit silly not having summed it for myself yet.


in the meantime, a few more that i did bother bringing home at one time/outing or another for my own fancyful bemusement

[link to imgur.com (secure)]
[link to imgur.com (secure)]

peace be with you
Anonymous Coward (OP)
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10/16/2020 10:00 PM
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Re: geology question: is there a term for these sort of incision marks on river cobbles?
bump

bonghit
Zovalex

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10/16/2020 10:47 PM

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Re: geology question: is there a term for these sort of incision marks on river cobbles?
Traveling Route 93 in Arizona, I stopped to climb on some very large boulders that had the same formation. They looked like they had been superheated, became semi-liquid forming bulges with smooth round curves, but developing cracks and striations when cooling.

Massive piles of such rocks in the middle of nowhere, as if they were asteroid debris that had fallen to earth thousands of years ago.

.
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Anonymous Coward (OP)
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10/16/2020 11:28 PM
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Re: geology question: is there a term for these sort of incision marks on river cobbles?
Traveling Route 93 in Arizona, I stopped to climb on some very large boulders that had the same formation. They looked like they had been superheated, became semi-liquid forming bulges with smooth round curves, but developing cracks and striations when cooling.

Massive piles of such rocks in the middle of nowhere, as if they were asteroid debris that had fallen to earth thousands of years ago.

.
 Quoting: Zovalex


very interesting. arizona is a bit removed from eastern canada as far as the glacial epochs go, from what i understand. perhaps any link(s) between the two do indeed go further back or beyond any relatively recent surfacd events?

hmm
Thomas Cruciamen

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10/17/2020 09:06 AM
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Re: geology question: is there a term for these sort of incision marks on river cobbles?
This is eastern Canada?
Thomas Cruciamen

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10/17/2020 09:08 AM
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Re: geology question: is there a term for these sort of incision marks on river cobbles?
This is significant. There are many who are trying to prove the Younger-Dyras Impact Hypothesis. This is where I believe the major impacts occurred. Would you mind sharing a more precise location? I would love to look at it on sat imagery.
Thomas Cruciamen

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10/17/2020 01:54 PM
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Re: geology question: is there a term for these sort of incision marks on river cobbles?
[link to www.impact-structures.com]
Thomas Cruciamen

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10/17/2020 01:56 PM
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Re: geology question: is there a term for these sort of incision marks on river cobbles?
A cool example of a stone within a relatively small radius of the impact site at the time of the event.
Thomas Cruciamen

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10/17/2020 02:08 PM
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Re: geology question: is there a term for these sort of incision marks on river cobbles?
Traveling Route 93 in Arizona, I stopped to climb on some very large boulders that had the same formation. They looked like they had been superheated, became semi-liquid forming bulges with smooth round curves, but developing cracks and striations when cooling.

Massive piles of such rocks in the middle of nowhere, as if they were asteroid debris that had fallen to earth thousands of years ago.

.
 Quoting: Zovalex


very interesting. arizona is a bit removed from eastern canada as far as the glacial epochs go, from what i understand. perhaps any link(s) between the two do indeed go further back or beyond any relatively recent surfacd events?

hmm
 Quoting: Anonymous Coward 79314612


When considering the exceptionally massive flooding from an ice sheet struck multiple times scenario something like that could have easily been carried by the water. It was shocked, thus fused into its position by the heat generated in the tiny fraction of a second and swept away soon after. I think it scoured the central U.S. from Gulf coast to the Great Lakes. The Lake Missoula floods I believe were part of the same event. Sverdrup; "..oceanography, a sverdrup is a non-SI metric unit of flow, with 1 Sv equal to 1 million cubic metres per second; it is equivalent to the SI derived unit cubic hectometer per second. It is used almost exclusively in oceanography to measure the volumetric rate of transport of ocean currents" That said, a formation such as what was mentioned earlier could easily be a seperate incident too.
Anonymous Coward (OP)
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10/17/2020 07:37 PM
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Re: geology question: is there a term for these sort of incision marks on river cobbles?
alright alright.............



.................................................


...........pretty much right along the diving lines of madawaska and victoria counties


...there's what once used to be a grand-er sight of rushing and crashing waters situated in the middle of all this that might or might not have any defining feature, clue or role in finding resolution to what you seek to answer....


but it's always fun looking nonetheless, eh


[link to imgur.com (secure)]
[link to imgur.com (secure)]
Anonymous Coward
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10/17/2020 09:26 PM
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Re: geology question: is there a term for these sort of incision marks on river cobbles?
bedding planes
Ricky Retardo

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10/17/2020 10:15 PM
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Re: geology question: is there a term for these sort of incision marks on river cobbles?
check out the fossil forum. they might have answers.
Thomas Cruciamen

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10/18/2020 10:56 AM
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Re: geology question: is there a term for these sort of incision marks on river cobbles?
alright alright.............



.................................................


...........pretty much right along the diving lines of madawaska and victoria counties


...there's what once used to be a grand-er sight of rushing and crashing waters situated in the middle of all this that might or might not have any defining feature, clue or role in finding resolution to what you seek to answer....


but it's always fun looking nonetheless, eh


[link to imgur.com (secure)]
[link to imgur.com (secure)]
 Quoting: Anonymous Coward 79314612


Indeed it is fun looking. Thanks for sharing!
Torchie

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10/18/2020 11:12 AM

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Re: geology question: is there a term for these sort of incision marks on river cobbles?
I bit some like that

they were in the pasture when I was grazing.
untying the shoelaces of the internet one post at a time

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go GIT in your STALL!

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Thomas Cruciamen

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10/18/2020 11:54 AM
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Re: geology question: is there a term for these sort of incision marks on river cobbles?
check out the fossil forum. they might have answers.
 Quoting: Ricky Retardo


Cool that you mention that forum. I just discovered it the other day while trying to id what I think is likely a hash plate.
Thomas Cruciamen

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10/18/2020 11:59 AM
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Re: geology question: is there a term for these sort of incision marks on river cobbles?
It is fascinating that the strata in that area is perpendicular to its original orientation. Imagine the forces required to accomplish that!
Thomas Cruciamen

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10/18/2020 12:08 PM
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Re: geology question: is there a term for these sort of incision marks on river cobbles?
Traveling Route 93 in Arizona, I stopped to climb on some very large boulders that had the same formation. They looked like they had been superheated, became semi-liquid forming bulges with smooth round curves, but developing cracks and striations when cooling.

Massive piles of such rocks in the middle of nowhere, as if they were asteroid debris that had fallen to earth thousands of years ago.

.
 Quoting: Zovalex


The cracks, provided that the stones are fused, would have been the result of the shockwave ripping through them primarily. The welding, if you will, would have happened in the microseconds immediately following that wave. Seconds later the melt water pulse would have charged into the cavity and started massive subglacial flooding that would have melted still more ice. There are vast boulder fields in the Blue Ridge mountains that I think are likely a result of this same event. Though, it would seem that the shocked cobble is not found that far south.
Thomas Cruciamen

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10/18/2020 12:09 PM
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Re: geology question: is there a term for these sort of incision marks on river cobbles?
The same shock wave, if the piles of stones are fused into the arrangement you saw, would have been responsible for this as well.
Thomas Cruciamen

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10/18/2020 12:12 PM
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Re: geology question: is there a term for these sort of incision marks on river cobbles?
That is IF they were carried that far. Which, seems more and more unlikely the more I look. But, our planet has been struck plenty of times for those to be from an entirely separate event to say the least.
Thomas Cruciamen

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10/18/2020 12:24 PM
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Re: geology question: is there a term for these sort of incision marks on river cobbles?
Traveling Route 93 in Arizona, I stopped to climb on some very large boulders that had the same formation. They looked like they had been superheated, became semi-liquid forming bulges with smooth round curves, but developing cracks and striations when cooling.

Massive piles of such rocks in the middle of nowhere, as if they were asteroid debris that had fallen to earth thousands of years ago.

.
 Quoting: Zovalex


The cracks, provided that the stones are fused, would have been the result of the shockwave ripping through them primarily. The welding, if you will, would have happened in the microseconds immediately following that wave. Seconds later the melt water pulse would have charged into the cavity and started massive subglacial flooding that would have melted still more ice. There are vast boulder fields in the Blue Ridge mountains that I think are likely a result of this same event. Though, it would seem that the shocked cobble is not found that far south.
 Quoting: Thomas Cruciamen

Correction, Appalachians.
Anonymous Coward
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10/18/2020 01:33 PM
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Re: geology question: is there a term for these sort of incision marks on river cobbles?
Correction, Appalachians.
 Quoting: Thomas Cruciamen


and Alleghenies?

OP here on-site, enjoying some sunny mid-teen (celsius) weather and just eyeing out a few that fit the program here...the whole "beach" here could almost be considered littered with every size, type and facet one could bother wanting to look for


[link to imgur.com (secure)]
[link to imgur.com (secure)]

i might just end up bringing one or two of these home with me





GLP