YellowKnife Bay - Page 26

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Fred


Posts: xxx

Reply: 501



PostPosted: June 22, 2013 3:35 PM 

the link is screwy.

Fred


Posts: xxx

Reply: 502



PostPosted: June 22, 2013 3:35 PM 

just copy and paste....

hortonheardawho


Posts: 3465

Reply: 503



PostPosted: June 22, 2013 5:26 PM 

Fred, by now you should KNOW that you can't post DIRECT links to Flickr pictures.

Unfortunately, the new Flickr "Metro" look sort'a hides the code you need to copy and paste.

To get to the code:

From the picture's page, click on the third icon on the bottom of the picture - which looks like a box with an hooked arrow pointing out of it. The icon shows a label "More ways to share" if the mouse cursor lingers over it.

Click on Grab the HTML/BBCode link, select the size icon you want ( I usually use 500 as the width ), select the radio button HTML and then copy the text in the "Copy and paste the code below" text box.

Finally, paste that code into your comment.

After you repost the images I will delete your unsuccessful comments.

MPJ


Posts: 250

Reply: 504



PostPosted: March 20, 2014 4:06 PM 

During my latest revisit of Yellowknife Bay - started to redo all gigapans with the raw camera data from the PDS release(s)- I stumbled across something which could be an explanation for the peculiar "cratering" or bubbles seen on all the blue/green mats/coatings in the area:

Could the round light colored pebbles which are attached to the lower rock be the source of all that pockmarks? Though quite rarely, in the new gigapan those whitish pebbles are also seen attached to the coatings of surrounding larger rocks and some on the ground (very rare).

Also all the previously identified peculiarities keeps reappearing in sharper images ("Hammerhead",white substance in a rocks shadow which disappears in a later midday image; peculiar bits and pieces which looks like skeletal pieces of former macro-life et cetera...)

New Gigapan: http://gigapan.com/gigapans/151794

LWS


Posts: 3062

Reply: 505



PostPosted: March 20, 2014 8:49 PM 

Hi MPJ; I hadn't seen that image earlier. Could you give the sol number. It looks like one of the possible bio images I've seen so far.

Winston

MPJ


Posts: 250

Reply: 506



PostPosted: March 21, 2014 4:24 AM 

Hi Winston, the Sol was 173 - initial jpg release:

Unfortunately MAHLI was that busy documenting the drilling there that no single hand lens observation of surroundings other than the drilled slab was made on that Sol.

mann


Posts: 161

Reply: 507



PostPosted: March 21, 2014 11:15 AM 

THAT, is a very nice find MPJ!

Looks like some possible dust covered lichens.
it for sure is something that has developed recently, rather than weathered out of the rock.

is there a way to get cross eyed?

RJS


Posts: 125

Reply: 508



PostPosted: March 21, 2014 1:13 PM 


MPJ, nice gigapan re 504. Regarding your statement "peculiar bits and pieces which looks like skeletal pieces of former macro-life et cetera.." I agree. However, as you said, the team was so much into drilling at the time they seemed to ignore all the other interesting stuff around them. After drilling they were then in a hurry to start the trip to Mt. Sharp. And so we'll never know for sure. Too bad.

Kye Goodwin


Posts: 1166

Reply: 509



PostPosted: March 21, 2014 1:24 PM 

MPJ, re your 504, That's beautiful work on the gigapan, Thanks. It took me a long time to find the "round light colored pebbles" in the panorama. (They are in the far lower right corner for anyone who is still looking.) We should all keep our eyes open for more.

The pan includes my favourite sharp little trench (just right of center, near the bottom, on the far side of a rock slab that is flush with the soil) :

It seems that disturbance on slopes is not all the activity here. This trench with soil crust blocks falling in must also be an example of recent activity. Here it looks like very localized SUBSIDENCE.

I've found the pan useful for studying the distribution of patches of dark sand. There are many in this area. They stand out really clearly in these color images. This is a good place to contemplate what process creates them and keeps them clear of dust.

Kye Goodwin


Posts: 1166

Reply: 510



PostPosted: March 21, 2014 1:38 PM 

MPJ, RJS, about the "peculiar bits and pieces which looks like skeletal pieces of former macro-life et cetera.." . There is another way altogether that life might be involved in creating those "peculiar bits and pieces": by "directed" EROSION that has evolved through adaptation (natural selection) to create better habitat for the eroders. For example, if rock shelters are useful to Mars life, then maybe it is no accident that this area has such a spectacular abundance of spaces under rock outcrops.

MPJ


Posts: 250

Reply: 511



PostPosted: March 21, 2014 3:11 PM 

Kye, while zooming across that trench I immediately thought about your current discussion with newboy as well. Smile
And yes the areas/spaces under the rocks are very interesting in many respects here.

Regarding the light colored roundish attachments of rocks with that pale blue/green pockmarketed coatings: I have a certain feeling that there is a connection to the whitish veins seen at some of the larger rocks in the middle/upper right quadrant of the pan. Nearby of that veins white specks are also present which i think are exactly that light colored roundish attachments seen in close-up of re 504.

YkB is a strong case for human explorers! Smile

mann, a stereoscopic view is possible but the decision for a "blind" left eye (Mastcam left) makes them quite blurry. I can try doin one next week (havnt got the right hardware at home and storage at home).
My last try on a wobble 3d of Mastcam images was this of a feature also in Yellowknife Bay (Sol 192):
http://i684.photobucket.com/albums/vv202/marsphotojournal/MC192_1_zpse94bdce4.gif

Horton can tell a better story of doing 3ds with MSL mastcam images I guess. Very Happy

RJS


Posts: 125

Reply: 512



PostPosted: March 21, 2014 4:59 PM 


MPJ; are you thinking about doing more gigapans of YKB. I could spend hours looking at these. So much to see and ponder.

Kye, re your theory of "directed" erosion (which is an interesting one), you realize the rock guys will argue "just weathered rocks and beds". We really need to study these anomalies to know for sure. Hopefully we can find more @ Kimberly or the base of Mt. Sharp. And take the time to study them a little closer.

MPJ


Posts: 250

Reply: 513



PostPosted: March 21, 2014 5:58 PM 

RJS, I plan the YkB Mastcam100 superpano - redone with PDS data - for next week but you can view a few older YkB panos (using the compressed jpg release images) in my and other portfolios on Gigapan already.

I have some difficulties with the just wind-erosion explanation too. After spending "some" time with the MSL close-up imagery Iam pretty confident that certain other ersosional agents are at work also.

Are there any examples of wind eroded only areas which almost look like a bone-yard in detail (not to speak of peculiar pockmarked rock-coatings) on Earth? Still the time-frames on Mars are a valid option for "wind erosion only" which cant be contented easily. Smile

MPJ


Posts: 250

Reply: 514



PostPosted: March 28, 2014 8:51 AM 

ChemCam close-ups in the real raw data from PDS are more interesting than i had thought from the initial raw jpg-releases.

here is an example of the "pockmarks" or bubbles of the YkB coatings:
http://planetary.s3.amazonaws.com/data/msl/pds/chemcam/cr0_414535997prc_f0060000ccam02192l1.png

Here is a full list of PDS ChemCam images provided by Ms. Lakdawalla:
[link]

RJS


Posts: 125

Reply: 515



PostPosted: March 28, 2014 12:13 PM 


Thanks for the link to Ms. Lakdawalla's site. Wow; these ChemCam images are the sharpest I've ever seen; such detail!

Kye Goodwin


Posts: 1166

Reply: 516



PostPosted: March 28, 2014 1:26 PM 

RJS, Thanks for your interest in directed erosion (reply 512). I've been thinking about the "berries on stems" that Oppy encountered and this example of something similar at Gale: (center foreground)

I think that most observers, including the mainstream, would agree with this description of the process: The stems have been formed in-place by the removal of the surrounding rock, and the only thing special about the stems is their proximity to the berries (pebbles in this case), that is, they aren't present as some sort of extra-resistant material before the erosion process begins. Given just this, the stems are a strong argument against wind as the primary agent of erosion. It is just asking too much of the wind, not in power, but in precision, and this is true even where the stems point in the same general direction, which they sure do not in the example above. I mean, you've got to visualize all that surrounding rock being cut away while these delicate stems persist on the same eroding surface. Sand saltation erosion could not be a delicate process as sand grains would fly in long straight paths in the thin air and would deliver a lot of collision energy to any surface they happened to strike. There could be a more sensitive process in erosion by suspended dust, which could at least swirl around with the air and possibly produce a more complicated result, but there is still no obvious reason why dust erosion would spare the stems for all the millions of years needed to erode the rock.

The berries and other pebbles on stems are evidence of carefully directed erosion. I'm guessing it happened underground and has no relation to flying particles.

The berries and pebbles on stems tend to occur in the same places as the slope activity and sharp little trenches. See the sand movement in a fissure center right in that example.

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