38 MTJIiLION ISLAND. 



Island shales. It is barely visible to tbe naked eye. You 

 may see it under the microscope on the table. Experts cannot 

 determine its character. They think it may be a " Conodont," 

 that is to say the jaws of an Annelid. Conodonts occur in rocks 

 as ancient as the Upper Cambrian. 



It is in your power, ladies and gentlemen, to settle this 

 matter. When you next visit Mullion Island, take your hammers 

 and search the shales which accompany the cherts. A lucky 

 blow may disclose a fossil that will once for all determine the 

 age of these rocks, and as similar radiolarian cherts have been 

 traced for 25 miles E.N.E. of Mullion Island on the mainland, 

 it may settle once for all the age of our rocks further east, and 

 furnish a " datum line or horizon of reference " which will give 

 a clue to the true geology of our county. 



