sharponlooker, 2 months ago to random

My folks are on an seniors' excursion in Catalunya; they just sent me this photo, I think from La Mussara, and I had to resist the urge to preach abt #IAmNotAGeologistTMBut 🙃

sharponlooker, 4 months ago to random

Thread of papers from last boost: https://astrodon.social/@TMEubanks/111869966667933015

Horgan et al, "Campaign Overview and Initial Results from Exploration of the Margin Unit in Jezero Crater by the Perseverance Rover"
https://www.hou.usra.edu/meetings/lpsc2024/pdf/2624.pdf

#JezeroDeltaScience

Extract from the preliminary interpretations

sharponlooker, 9 months ago to random

I found this old(ish) paper about #JezeroCrater and the delta really educative and accessible even when #IAmNotAGeologistTMBut

Schon et al. "An overfilled lacustrine system and progradational delta in Jezero crater, Mars: Implications for Noachian climate"
https://www.researchgate.net/publication/258688201_An_overfilled_lacustrine_system_and_progradational_delta_in_Jezero_crater_Mars_Implications_for_Noachian_climate

A lot of substance and recognizable features in almost every figure, some examples:

Fig. 10: Escarpment of the deltaic deposits truncates a scroll bar. The orientation of this meander indicates that the direction of migration was proximal (toward the watershed, away from the escarpment). This orientation requires a more extensive delta in the past.
Fig. 12: Scroll bars. Numerous scroll bars (lateral accretion topography) are observed adjacent to Belva crater on the delta plain and stratigraphically below erosionally-resistant materials interpreted as channel sands. These features (A–H) result from the development of point bars at the inside of distributary channel meander bends. Arrows indicate the direction of channel migration. Unconformities in the scroll bar patterns are common and suggest successive channel migrations.
Fig. 14: Channel deposits. (A) Stratigraphically above the scroll bars and epsilon cross-bedding are elongate erosionally resistant materials interpreted as channel sands. Consistent with the interpretation of a more extensive delta in the past, these channel sands would have been deposits in distributary channels sourcing more distal depocenters, and are high-standing because they are more erosionally resistant than overbank deposits. (B) Channels sands are mapped in green, scroll bars in blue, and craters in purple.

sharponlooker, 10 months ago to random

Trying new ways to visualize the #JezeroCrater delta chronology suggested in this preliminary paper
https://www.hou.usra.edu/meetings/lpsc2023/pdf/2067.pdf

I've animated the classified deposits in their rough form and with the estimated timeline. #PerseveranceRover is currently traversing deposit 'k'.

#IAmNotAGeologistTMBut

Animation of handdrawn deposits matching those in the paper's map, gradually appearing according to the suggested timeline.

65dBnoise, 10 months ago (edited 10 months ago) to space

Looks like some rocks around this area had an outer layer harder than their interior, like a shell, parts of which stayed in place while the interior eroded.

But, IANAG™ = I Am Not A Geologist

Processed, leveled MCZ_RIGHT, FL: 110mm
Sol: 866, RMC: 42.0000, LMST: 11:53:25
Original: https://mars.nasa.gov/mars2020-raw-images/pub/ods/surface/sol/00866/ids/edr/browse/zcam/ZR0_0866_0743816843_409EBY_N0420000ZCAM08871_1100LMJ01.png
Credit: #NASA/JPL-Caltech/ASU/65dBnoise

#Perseverance #Mars2020 #Solarocks #Space

65dBnoise, 10 months ago to space

Amazing.

Processed SHERLOC_WATSON
Sol: 857, RMC: 42.0000, LMST: 13:47:55
Original: https://mars.nasa.gov/mars2020-raw-images/pub/ods/surface/sol/00857/ids/edr/browse/shrlc/SIF_0857_0743024987_582EBY_N0420000SRLC04000_0000LMJ01.png
Credit: #NASA/JPL-Caltech/65dBnoise

#Perseverance #Mars2020 #Solarocks #Space