(Robert Clark) wrote in message om...
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/Dyn...1/685ysvia.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 ); 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 Biología 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.

Big deal... You don't need to radiate Mars to know that...

I suggested that a few years ago, studying the beddings inside larger
craters and the several dark streaks coming from sedimentation
layerings. I can even say one thing. There is not an water aquifer but
remains of water aquifers. Most of them are going terminal.

How can one detect this. Just pick up Arabia's pics, follow a place
with those "wet" dark streaks and try to find zones of clear layering
and with a few good streaks. Better if they are located not on one
side of a hill but a little spread around. For example on a crater
with a good rim and with hills around. If you do so then you get many
intersting things. A few places still soak with water at certain
layers. However the water-rich layerings are usually getting quite
eroded, may due to internal movement of water. Sometimes, there are
signs of subsidiation. So, a few millions of years more and water is
mostly gone. Some may migrate over lower zones but it will be very
residual I think...

Then the partisans of Dead-Dried Mars will claim victory....

Janssen Crater is one of the places that is still highly rich in
water.


cf.
exoscientist
03/29/03 12:04 PM
"Mars Water, Odd Surface Features Tied to Life."
http://uplink.space.com/showthreaded...&Number=463425



Bob Clark


Garrison Hilliard wrote in message ...