Finishing work in and around Seitah, sols 238-378

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Finishing work in and around Seitah, sols 238-378

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john_s View Member Profile	Nov 18 2021, 06:25 PM Post #46
Member Group: Members Posts: 701 Joined: 3-December 04 From: Boulder, Colorado, USA Member No.: 117	Looks like there may be some ripple structures preserved in the rock in that image. John

tdemko View Member Profile	Nov 19 2021, 12:56 AM Post #47
Member Group: Members Posts: 153 Joined: 8-February 04 From: Phoenix, AZ USA Member No.: 9	QUOTE (john_s @ Nov 18 2021, 01:25 PM) Looks like there may be some ripple structures preserved in the rock in that image. I see what you are talking about, at some of the bed boundaries. There is also a fallen piece that has a bedding plane exposed with what could be small 3D dunes or ripples (can't quite determine the scale). They both are not pleasingly preserved, at least from here, so we'll have to wait and see. We've been seeing distinct bed boundaries for a while, in several places along the traverse, at several stratigraphic intervals. None of them looked completely planar, but there were no obvious ripple forms either, let alone cross-stratification within the beds. After finally determining that the grain size was in the medium-coarse to granule range, that's not surprising. Maybe the grain size is smaller in these outcrops, and ripples and dunes could have formed during the flows. -------------------- Tim Demko BioLink site

xflare View Member Profile	Nov 19 2021, 08:23 PM Post #48
Member Group: Members Posts: 282 Joined: 18-June 04 Member No.: 84	QUOTE (john_s @ Nov 18 2021, 07:25 PM) Looks like there may be some ripple structures preserved in the rock in that image. John Which image are you referring to?

john_s View Member Profile	Nov 19 2021, 08:46 PM Post #49
Member Group: Members Posts: 701 Joined: 3-December 04 From: Boulder, Colorado, USA Member No.: 117	This post. Specifically the wavy bedding planes left of center, and the funky-looking slab surface on the slope just lower right of center. John

tau

Nov 20 2021, 12:59 PM

Post #50

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Here is a detail of the image mentioned above. Those two rocks caught my attention, too.

tau

Nov 20 2021, 08:10 PM

Post #51

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QUOTE (tdemko @ Nov 19 2021, 01:56 AM)

I see what you are talking about, at some of the bed boundaries. There is also a fallen piece that has a bedding plane exposed with what could be small 3D dunes or ripples (can't quite determine the scale). . . .

Regarding the scale, here is a sol 265 Mastcam-Z context panorama for the sol 265 SuperCam detail image (bluish rectangle to the right), and a HiRISE map of the panorama's field of view.
The target taken by the SuperCam is circled on the map. It is almost exactly 200 m away from the rover.
With some calculations it came out that the visible distance between the suspected ripple crests is about 9 to 10 cm in the SuperCam detail image (see previous post).

Phil Stooke View Member Profile	Nov 24 2021, 06:44 PM Post #52
Solar System Cartographer Group: Members Posts: 10173 Joined: 5-April 05 From: Canada Member No.: 227	A second drill hole and sample just done at Brac. https://mars.nasa.gov/mars2020-raw-images/p..._0LLJ01_800.jpg Phil -------------------- ... because the Solar System ain't gonna map itself. Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PD: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain)

neo56

Nov 24 2021, 08:50 PM

Post #53

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Here is a picture of the second drill hole in Brac taken on sol 271.

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Thomas Appéré Personal webpage My flickr gallery Twitter

Phil Stooke

Nov 26 2021, 12:31 AM

Post #54

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I have collected and labelled images of the various sampling (and related activities) sites with the names as I know them so far. I don't yet have a name for the most recent sample hole. All images are oriented roughly north-up, not in raw image orientation.

Phil

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... because the Solar System ain't gonna map itself.

Also to be found posting similar content on https://mastodon.social/@PhilStooke
Maps for download (free PD: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf
NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain)

vikingmars

Nov 26 2021, 05:00 PM

Post #55

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Sol 265 partial pan and also in 3D. Enjoy

vikingmars

Nov 26 2021, 05:03 PM

Post #56

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Because the distances between the foreground and background are big, take some time to let your eyes adapt

PaulH51

Nov 27 2021, 01:46 AM

Post #57

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Sol 271: CacheCam 2-tile fusion stitch of sample number 5 in its tube prior to sealing, roughly assembled in MS-ICE (unprocessed other than the stitch)