5
   

what are these marks on the rock?

 
 
MaAxx8
 
Reply Thu 25 Jun, 2015 09:59 am
Hi, can anyone tell me what are these marks on the grey rock?
thank you a lot!!
http://www.mediafire.com/convkey/f365/qm90a8a9pjxomjbzg.jpg
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Type: Question • Score: 5 • Views: 1,174 • Replies: 4
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dalehileman
 
  0  
Reply Thu 25 Jun, 2015 12:25 pm
@MaAxx8,
My guess, Max, furrows caused by the passage of harder rocks
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rosborne979
 
  1  
Reply Thu 25 Jun, 2015 06:30 pm
@MaAxx8,
Where are these rocks located? What is the approximate age of the geology in that area? Are these erratics or are they native to the area?

dalehileman
 
  0  
Reply Sat 27 Jun, 2015 11:37 am
@rosborne979,
Ros, for what it's worth--probably not much-- it looks like chalcedony deposit on sandstone
0 Replies
 
KBQ1006
 
  0  
Reply Mon 6 Jul, 2015 07:44 pm
@MaAxx8,
I would first suggest identifying the composition (i.e., mineralogy) and rock type (igneous, sedimentary, or metamorphic). Once you understand these two things along with the mineralogy and rock type of surrounding/adjacent formations you can begin to postulate about the desposional or formational environment for this rock and the surrounding formations, which in turn may answer your question.
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