M
munkin
Guest
I recently read a very interesting concretion post on the Bad Astronomy Board. Essentially the questions raised were why the form of the concretions were exactly the same size and form through all the strata in Endurance even though the layers differed chemically.<br /><br />This has become a very vexing question and has left me to puzzle this over the last few months until I read that someone else has questions about this as well. Interestingly, no other posters have brought this up. Should the concretions that are all over Meridiani be in different sizes and shapes according to the chemical layers that they are formed? Would the shapes and sizes tend to change between layers of evaporites as they are chemically different ie. chlorine increases as the layers deepen in Endurance. Why are they all the same size and shape at Meridiani even though most of the concretions on earth are essetially speriodal and differ in size.<br /><br />For example: <br /><br /><br />http://www.desertusa.com/mag98/oct/papr/geo_conc.html <br /><br />http://www.amonline.net.au/factsheets/geodes.htm<br /><br />http://epsc.wustl.edu/admin/resources/meteorites/meteorwrongs/concretions.htm<br /><br />http://home.att.net/~amcimages/hyde.html (please note that these were the only concretion examples that I found completely uniform, had stems and were biological in origin- these were shaped in crab holes)