26 GEOLOGY OF THE LOTHIANS. 



veins are of a contemporaneons formation with the clay- 

 ironstone in which they are contained, is an opinion adopt- 

 ed by Dr Hutton and also by Professor Jameson, the one 

 reasoning on Plutonian, the other on Neptunian, principles. 

 Ichthyolitic coprolites are abundantly distributed through- 

 out the lenticular masses of clay-ironstone, and specimens 

 may easily be procured bearing more or less perfect intesti- 

 nal impressions. In the Edinburgh Philosophical Journal, 

 vol. xxxii. p. 165, analyses of two of these interesting organic 

 relics, by Dr W.Gregory and Mr R. Walker, are published. 

 The results of these analyses we may here subjoin. 



1. Analysis of a Coprolite found in Clay-ironstone, 



Wardie. 



Organic matter, \ 



Sulphuret of Iron, I . . . 4.134 



Siliceous matter, ) 



Carbonate of Lime, .... 61.000 



Carbonate of Magnesia, . . . 13.568 



Oxide of Iron with a little Alumina, 6.400 



Phosphate of Lime, .... 9.576 



Fluoride of Calcium, ~» 



Oxide of Manganese, j ' ' a trace 



Water and loss, 5.332 



100.000 



% Analysis of a Coprolite found in Clay-ironstone, Fife- 

 shire. 



Matter insoluble in Muriatic Acid ) „ „_. 



and chiefly organic, J Adau 



Carbonate of Lime, 24.255 



Carbonate of Magnesia, 2.888 



Phosphate of Lime, 63.596 



"Water, 3.328 



Phosphate of Magnesia \ 



Oxide of Iron, i 



Oxide of Manganese, > . • . . trace. 



Fluoric Acid, I 



97.447 

 Besides containing coprolites, the clay-ironstone of the 



