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                         Stromatolites, Yesnaby 
                        07000 
                        192 
                        Orkney - Yesnaby 
                        Stromatolites formed from blue-green algae in the 380 million years old Orcadian Old Red Sandstone at Yesnaby 
                        16 May 2014 
                        
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                         Stromatolites, Yesnaby 
                        06999 
                        192 
                        Orkney - Yesnaby 
                        Stromatolites formed from blue-green algae in the 380 million years old Orcadian Old Red Sandstone at Yesnaby 
                        16 May 2014 
                        
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