FOSSIL CORALLINES. 49 



been discovered by Dr. Callaway, in the Upper 

 Lingula Flags, and one is named Bryogmptus Callavei. 

 Another genus is Clonograptns> found in the Shineton 

 shales of Shropshire. 



One of the very best hunting-grounds for British 

 Graptolites is Dumfriesshire. That county is largely 

 underlaid by Lower Silurian rocks, originally deposited 

 along the floors of ancient seas as so much marine 

 mud. Little did the numerous Graptolites know that 

 they were forming no insignificant part in laying 

 down the foundations of the " Land of brown heath 

 and shaggy wood ; " a land to be uplifted for ages 

 above sea-levels, on which the storms and atmo- 

 spherical action of thousands of centuries would be 

 expended, until its surface had become carved into 

 hill and dale, lake and valley, gorge and glen, over all 

 of which genius should throw the halo of ever-endur- 

 ing romance ! This wild land teems with as many 

 relics of the semi-barbarous mediaeval human period 

 as it does with primeval fossils. The heroes not only 

 of Scott, but of many an unchronicled feud and deed 

 of daring, have sought shelter in glens and linns 

 where the black shales through which these had been 

 cut were crowded with pyritized Graptolites. At 

 Moffat, for instance, the black shales of the Silurian 

 rocks abound with these interesting fossils. Owing 

 to the softish nature of the shales, and the way in 

 which they allow water to ooze through their joints, 

 many of the glens in them are well wooded, and 



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