XPost: sci.geo.geology, alt.sci.planetary   
   From: carsten.troelsgaard@mail.dk   
      
   "Timothy Demko"  skrev i en meddelelse   
   news:bv43ln$pap$1@lenny.tc.umn.edu...   
   > My first impression of the much-talked-about Meridiani outcrop is that   
   > it looks like a fractured, platey basalt flow, maybe even pahoehoe. In   
   > the upper right hand corner of the PanCam image, right at the edge of   
   > the picture, there are some interesting curvilinear features that look   
   > like a ropey surface.   
      
   The curvilinear feature looks like a   
   dissolution/precipitation-mineralisation to me   
      
   > On the other hand, I could also convince myself   
   > that those features also look like an oblique section through very   
   > large-scale trough cross-bedding (i.e. in a sandstone)...which would be   
   > very, very cool if it is!   
      
   We'll soon be able to tell   
      
   In the meanwhile   
   What's the significance of a solid rock?   
      
   1) A fused volcanic ... a possibility   
   2) Cemented particles (being it layed out by wind, water or ejected)   
   Diagenetic processes is thorughly studied on Earth - all involving water.   
   What process would be working if not water?   
      
   /Carsten   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)