Thanks for the links. Dohm et.al. have proposed an ancient water filled basin in Arabia. This is supported by the high hydrogen readings from GRS and by geomorphology:
Did an impact basin make a water "reservoir" on Mars?
More evidence surfaces that the Red Planet has long been rich in water.
by Robert Burnham
http://www.astronomy.com/Content/Dynamic/Articles/000/000/001/685ysvia.asp
ANCIENT GIANT BASIN/AQUIFER SYSTEM IN THE ARABIA REGION, MARS: James M. Dohm1, Nadine Barlow2, Jean-Pierre Williams3, Victor R. Baker1,4, Robert C. Anderson5, William V. Boynton4; Alberto G. Fairén6, Trent M. Hare7, 1Department of Hydrology and Water Resources, University of Arizona, Tucson, AZ, 85721 (jmd@hwr.arizona.edu); 2Dept. Physics and Astronomy, Northern Arizona University, Flagstaff, AZ, 86001; 3Dept. of Earth and Space Sciences, Univ. of California, CA 90095, 4Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ; 5Jet Propulsion Laboratory, Pasadena, CA; 6Centro de BiologÃa Molecular, Universidad Autónoma de Madrid, 28049 Cantoblanco, Madrid, Spain; 7U.S. Geological Survey, Flagstaff, AZ, 86001.
Lunar and Planetary Science XXXV (2004) 1209.pdf
http://www.lpi.usra.edu/meetings/lpsc2004/pdf/1209.pdf
They also suggest there may be a water aquifer there that may yet persist that can be detected by ground-penetrating radar as on Mars Express.
cf.
exoscientist
03/29/03 12:04 PM
"Mars Water, Odd Surface Features Tied to Life."
http://uplink.space.com/showthreaded.php?Cat=&Board=sciastro&Number=463425
Bob Clark
Space/Science » in reply to re: It's all about the bedforms.... and topography (wouldn't hurt).
Supports the idea of an ancient basin in Arabia Terra.
The whole thread (37 posts)
- NASA press conference title: "Opportunity Hits the Beach"
- Exactly how many tens of millions of years ago was all this supposed to have happened?
- Slides from the conference
- Another version of this news from MSNBC
- Alright you geologists out there.....
- re: Alright you geologists out there.....
- Geologists my eye. I want to see some fossil experts going over all these photos now, if they aren't already. (n/t)
- Climate
- It's all about the bedforms....
- re: I concur. I think some radiometric dating of the rocks & sediments is in order. (n/t)
- Sample return just became a lot more likely
- Some still images
- Squyres: "A habitable environment on Mars"
- Press release with photos
- Sedimentary rock! (n/t)
- Weiler: "Perhaps A Shallow, Salty Sea"
- You sure don't get beaches from water percolating up through the soil (n/t)
- re: NASA press conference title: "Opportunity Hits the Beach"
- Screen cap title