Back At Larry's Lookout - Unmanned Spaceflight.com

Back At Larry's Lookout

Guest_Sunspot_*	May 18 2005, 06:29 PM Post #1
Guests	Some pretty complex driving by the look of it: http://qt.exploratorium.edu/mars/spirit/fo...E0P1214R0M1.JPG Now this is odd: http://qt.exploratorium.edu/mars/spirit/na...E0P0617R0M1.JPG It looks like some of the rocks have slid down the dune

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CosmicRocker View Member Profile	May 22 2005, 07:29 AM Post #2
Senior Member Group: Members Posts: 2228 Joined: 1-December 04 From: Marble Falls, Texas, USA Member No.: 116	Sorry this is long, but I found myself on a roll... It definitely seems to be a "crusty unit," but going so far as to call it a "duricrust" seems unwarranted. I really haven't yet seen anything I'd call a true duricrust on Mars. I really prefer the "weakly cemented by salts" hypothesis. Water ice is a second choice for me. There were a few images from around sol 110 taken near Endurance that keep popping up as examples of duricrust, but taken in the context of the surroundings, they appear to me to be soil/dust covered slabs of fractured bedrock that were disturbed by Oppy's wheels. Purported examples of duricrust: http://marsrovers.jpl.nasa.gov/gallery/all...03P2584L7M1.JPG http://www.lyle.org/~markoff/pds/234567/1P...87L234567C1.JPG Context images showing the dust/soil covered plates of broken-up bedrock surrounding Endurance crater: http://marsrovers.jpl.nasa.gov/gallery/all...3P2366L7M1.HTML http://marsrovers.jpl.nasa.gov/gallery/all...3P2366L7M1.HTML http://www.lyle.org/~markoff/pds/257/1P137...P2361L257C1.JPG These are some that have been partially exhumed: http://www.lyle.org/~markoff/pds/257/1P138...P2295L257C1.JPG http://www.lyle.org/~markoff/pds/257/1P138...P2295L257C1.JPG -------------------- ...Tom I'm not a Space Fan, I'm a Space Exploration Enthusiast.

dvandorn View Member Profile	May 22 2005, 06:39 PM Post #3
Senior Member Group: Members Posts: 3419 Joined: 9-February 04 From: Minneapolis, MN, USA Member No.: 15	QUOTE (CosmicRocker @ May 22 2005, 02:29 AM) It definitely seems to be a "crusty unit," but going so far as to call it a "duricrust" seems unwarranted. I really haven't yet seen anything I'd call a true duricrust on Mars. I really prefer the "weakly cemented by salts" hypothesis. Water ice is a second choice for me. "Duricrust" is a term that was applied to some Viking soils back in the 1970s, to describe the cohesive properties of the upper few mm of some of the soils. As far as I've ever been able to tell, it's used in a descriptive, not a diagnostic, manner -- it describes the cohesive qualities of some top layers of Martian soils. It doesn't pre-suppose a reason for the cohesiveness, i.e., it doesn't assume that the duricrust is created by a permafrost layer or anything like that. (So the idea of an absolute "true duricrust" doesn't really enter the discussion, I don't think.) In fact, the conclusion of the original Viking team was that the duricrust is likely a weakly cemented unit resulting from evaporation of salts from groundwater. Since no evidence of current groundwater was returned, they didn't state that assumption as certain, but I know it was the preferred theory for the observed phenomenon. -the other Doug -------------------- “The trouble ain't that there is too many fools, but that the lightning ain't distributed right.” -Mark Twain

Posts in this topic

Sunspot Back At Larry's Lookout May 18 2005, 06:29 PM

Bill Harris Fascinating image. I'm not one of the "w... May 18 2005, 06:37 PM

Sunspot I thought it looked like a thin/harder crust on to... May 18 2005, 06:40 PM

mhoward QUOTE (Sunspot @ May 18 2005, 06:40 PM)I thou... May 18 2005, 07:13 PM

Edward Schmitz QUOTE (mhoward @ May 18 2005, 12:13 PM)QUOTE ... May 20 2005, 02:53 AM

Chmee That is my take of it too: A hard, plate-like crus... May 18 2005, 07:22 PM

john_s QUOTE (Chmee @ May 18 2005, 07:22 PM)That is ... May 18 2005, 08:25 PM

john_s Ignore this one- not sure what happened... May 18 2005, 08:30 PM

TheChemist I have the impression Spirit's previous visit ... May 18 2005, 09:34 PM

mhoward From Steve Squyres' latest update http://athen... May 18 2005, 10:59 PM

alan QUOTE (Sunspot @ May 18 2005, 06:40 PM)I thou... May 19 2005, 12:56 AM

Tman QUOTE (alan @ May 19 2005, 02:56 AM)QUOTE (Su... May 19 2005, 07:59 PM

mhoward A closeup of the "overhang" as I call it... May 19 2005, 08:32 PM

jvandriel A panoramic view of Larry's Lookout and surrou... May 19 2005, 08:36 PM

jvandriel And a view of the other side of Larry's lookou... May 19 2005, 08:38 PM

Phil Stooke Regarding that weird little slope failure thingy o... May 20 2005, 03:13 AM

lyford Tonight at her talk at JPL (of which I only caught... May 20 2005, 04:22 AM

CosmicRocker Yeah. I missed her lecture, too. Had to work lat... May 20 2005, 08:03 AM

john_s QUOTE (CosmicRocker @ May 20 2005, 08:03 AM)T... May 20 2005, 03:51 PM

JES QUOTE (CosmicRocker @ May 20 2005, 04:03 AM).... May 20 2005, 05:51 PM

Bob Shaw I agree regarding the slumped material. The platy ... May 21 2005, 01:35 PM

Jeff7 QUOTE (Bob Shaw @ May 21 2005, 09:35 AM)I agr... May 21 2005, 02:09 PM

jvandriel A panoramic view of the top of Larry's Lookout... May 20 2005, 08:56 AM

Phil Stooke I don't really think the RAT caused the slump ... May 20 2005, 05:17 PM

john_s QUOTE (Phil Stooke @ May 20 2005, 05:17 PM)I ... May 20 2005, 08:40 PM

CosmicRocker Well, this new hazcam shot really turns my "s... May 20 2005, 06:06 PM

mhoward Some color (sorry, I don't have time to stitch... May 20 2005, 07:32 PM

Nix Here's a pancam mosaic of four of the images p... May 20 2005, 10:19 PM

dilo QUOTE (NIX @ May 20 2005, 10:19 PM)Here's... May 21 2005, 10:50 PM

Bill Harris QUOTE (CosmicRocker @ May 20 2005, 12:06 PM)W... May 21 2005, 01:27 AM

Tman How about season, alternatively sun dont reached t... May 21 2005, 03:33 PM

aldo12xu Yes, I also agree that it's a hardened layer o... May 21 2005, 03:39 PM

Bob Shaw The paper on the duricrust posits some very credib... May 21 2005, 08:47 PM

CosmicRocker QUOTE (Bob Shaw @ May 21 2005, 02:47 PM)... A... May 22 2005, 06:16 AM

Bob Shaw The 'Tommy Gold' reference was more in reg... May 22 2005, 12:25 PM

dvandorn QUOTE (Bob Shaw @ May 22 2005, 07:25 AM)The ... May 22 2005, 06:54 PM

Bob Shaw But a flag-draped LM would have been *entertaining... May 22 2005, 07:38 PM

CosmicRocker Sorry this is long, but I found myself on a roll..... May 22 2005, 07:29 AM

dvandorn QUOTE (CosmicRocker @ May 22 2005, 02:29 AM)I... May 22 2005, 06:39 PM

CosmicRocker QUOTE (dvandorn @ May 22 2005, 12:39 PM)... May 23 2005, 03:36 AM

edstrick Tommy Gold and Fred Hoyle were similar "theor... May 23 2005, 04:43 AM

CosmicRocker When I saw this front hazcam today I initially tho... May 23 2005, 05:29 AM

Bubbinski Seeing some of the microscopic images from Spirit ... May 23 2005, 03:29 PM

mhoward QUOTE (Bubbinski @ May 23 2005, 03:29 PM)Seei... May 23 2005, 04:14 PM

Sunspot I had exactly the same thought when I saw these la... May 23 2005, 04:38 PM

glennwsmith I'm with you, gentlemen, this stuff DOES look ... May 24 2005, 02:04 AM

CosmicRocker OK. I can appreciate that there are certain simil... May 24 2005, 05:25 AM

DEChengst The full six frame mosaic sol 489: http://paranoi... May 24 2005, 05:14 PM

lyford QUOTE (DEChengst @ May 24 2005, 09:14 AM)Colo... May 24 2005, 06:49 PM

JES My first impression here was that I was looking at... May 25 2005, 01:33 AM

Bill Harris QUOTE My first impression here was that I was look... May 25 2005, 02:05 AM

CosmicRocker We received some MIs of the broken crust today. I... May 25 2005, 05:08 AM

Bill Harris Good mosaic. I've see something like this loc... May 25 2005, 11:04 AM

CosmicRocker Bill: I have seen similar things as well in sulfi... May 26 2005, 04:27 AM

dilo Here a super resolution outcrop image (sum of 8 Pa... May 26 2005, 06:04 AM

wyogold QUOTE (CosmicRocker @ May 26 2005, 04:27 AM)B... May 29 2005, 06:43 AM

Bill Harris The specular reflection was so unusual on dusty, w... May 26 2005, 02:09 PM

CosmicRocker Steve Squyres has a new update today, with a lot o... May 28 2005, 06:31 PM

CosmicRocker QUOTE (wyogold @ May 29 2005, 12:43 AM)Oh man... May 31 2005, 01:49 AM

CosmicRocker I noticed an interesting pancam sequence captured ... May 31 2005, 02:33 AM

dilo This is a color stitch from Sol497 (only the left ... Jun 2 2005, 07:25 AM

Tman Thanks, your pans show the first time Spirit's... Jun 2 2005, 11:49 AM

Phil Stooke This is a simple sketch map of the recent travels ... Jun 2 2005, 07:04 PM

dot.dk I took the opportunity (no pun) and put the 3d mod... Jun 2 2005, 08:01 PM

dilo Wonderful! Good idea from Tman and great appli... Jun 3 2005, 04:49 AM

dilo A larger version: Tman/Nirgal, do you think could... Jun 3 2005, 11:33 PM

Tman That's exactly what I was hoping for, but neve... Jun 2 2005, 08:20 PM

Bill Harris QUOTE I took the opportunity (no pun) and put the ... Jun 2 2005, 08:25 PM

Tman Could be dilo, could be But it seems to me ther... Jun 4 2005, 07:31 AM

jvandriel Spirit again on its way to the summit of Husband H... Jun 4 2005, 02:35 PM

dilo from Sol500 (images available only now...): If I... Jun 5 2005, 08:51 PM

Myran Wonderful image composites dilo. Looking at the la... Jun 6 2005, 01:12 AM

algorimancer Dilo, I like that one a lot ... it's my new de... Jun 6 2005, 03:06 PM

dilo QUOTE (algorimancer @ Jun 6 2005, 03:06 PM)Di... Jun 6 2005, 07:37 PM

Phil Stooke Yeah, great work! Phil Jun 6 2005, 07:50 PM

Bill Harris Wonderful-- it's my new Wallpaper, too. What ... Jun 7 2005, 01:48 AM

edstrick On Earth, sediment transport processes tend to sep... Jun 7 2005, 07:49 AM

dilo I integrated part of previous Larry's mosaic w... Jun 8 2005, 09:54 PM

Tesheiner Beautiful mosaic Dilo. Great work! I made a p... Jun 9 2005, 09:34 AM

Nirgal great work, dilo ! makes me all the more look... Jun 9 2005, 10:26 AM

aldo12xu Awesome work Dilo! And a great idea pointing ... Jun 9 2005, 02:22 PM

jvandriel Here is a panoramic view of Jibsheet, Gusev Crater... Jun 10 2005, 12:38 PM

jvandriel Here is a panoramic view of Gusev Crater with a go... Jun 10 2005, 02:16 PM

dilo Nice works, jvandriel. I made similar mosaic from ... Jun 11 2005, 04:49 AM

djellison QUOTE (dilo @ Jun 11 2005, 04:49 AM)Nice work... Jun 17 2005, 07:06 PM

dilo ...and this is the last (sniff) Larry's view f... Jun 18 2005, 06:52 PM

jvandriel Dilo, here is my version of the panoramic view of ... Jun 11 2005, 09:21 PM

dilo QUOTE (jvandriel @ Jun 11 2005, 09:21 PM)Dilo... Jun 11 2005, 11:52 PM

Bob Shaw Dilo: Excellent work! (and youse other guys,... Jun 11 2005, 11:56 PM

dilo Thanks, this is a beautiful example of successful ... Jun 12 2005, 06:15 AM

jvandriel Here is a better panoramic view of Larry's Loo... Jun 11 2005, 10:01 PM

Tman QUOTE (jvandriel @ Jun 12 2005, 12:01 AM)Here... Jun 12 2005, 07:39 PM

Nirgal havn't had the time to closely follow the foru... Jun 13 2005, 08:38 AM

Phil Stooke Yes, Dilo, we are getting a lot of that here, and ... Jun 12 2005, 01:44 PM

Nix Nice one dilo! Nico Jun 12 2005, 03:46 PM

alan Pan from 497,498,500 50! color images Full si... Jun 22 2005, 05:33 PM

avkillick QUOTE (alan @ Jun 22 2005, 10:33 AM)Pan from ... Jun 22 2005, 07:00 PM

Nix Great Alan! Jun 23 2005, 08:01 PM

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