Fossil Worm Cast/ holes

$100

These unusual opal fossils from Lighting Ridge in NSW  Australia are believed to be the excavation holes of ancient worms or shrimps. Some of these pieces show colour others are potch. Mined by Chris Chancerel at the Grawin in Lighting  Ridge  in the late 1980’s. 
These cast are Cretaceous 100 million years old.    Largest 25mm x 20mm 

 

 

 

 

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