What is the most interesting peice of sandstone you have found? Where are its orgins from?

Question: What is the most interesting peice of sandstone you have found? Where are its orgins from?
- Keywords:
  rock
Asked by Kiki to Jess, Jason on 14 Nov 2019.
- Jessica Franklin answered on 14 Nov 2019:
  
  The sandstones that I studied for my PhD contained parts from Greenland, Scotland and even some of the grains were from an ancient volcano somewhere to the north of Ireland that doesn’t exist anymore

Question: What is the most interesting peice of sandstone you have found? Where are its orgins from?