QUOTE (SigurRosFan @ Feb 9 2006, 08:36 PM)
"... some spherules are surrounded by a later generation cement. This requires multiple episodes of groundwater percolation following sand deposition." - Where are images of this spherules type?
Which abstract is this in?
I have argued that crusts seen in the MI images at the Opportunity site have the appearance of biological or sedimentary origin:
Newsgroups: sci.astro, alt.sci.planetary, sci.geo.geology, sci.geo.mineralogy, sci.bio.misc
From: rgregorycl...@yahoo.com (Robert Clark)
Date: 18 Mar 2004 16:26:04 -0800
Subject: Sedimentary films at Opportunity site.
I can't think of any way of producing films or crusts like these other
than through liquid water deposition or biological activity:
Microscopic Imager :: Sol 049 (14 images) http://origin.mars5.jpl.nasa.gov/gallery/a...unity_m049.html
Microscopic Imager :: Sol 050 (12 images) http://origin.mars5.jpl.nasa.gov/gallery/a...unity_m050.html
You may need to rotate some of these images to properly view positive and negative relief.
And Shaka on this board posted an MI image of Home Plate that showed a similar crust-like deposition: