GEOLOGY 



places clay balls crowded with fossils, at all angles, which they had picked 

 up whilst rolling in a soft condition, indicating nearness of actual 

 denudation. Finally, in the Northampton Sand we have the representative 

 of the Marlstone rock-bed, by its fossils linked to the beds below, and with 

 wood and ironstone indicating nearness to land ; its coral reefs, slates made 

 of calcareous sandy mud, beds of comminuted shell, and layers of small 

 pebbles all pointing to shallow, warm water. An abbreviated section of 

 the Upper Lias is given below ; further particulars may be obtained 

 from other sources.^ 



TYPICAL SECTION OF UPPER LIAS 



* Beeby Thompson, ' The Upper Lias of Northamptonshire,' Journ. North. Nat. Hist. 

 Soc, vol. iii. pp. 3, 183, 299; vol. iv. pp. 16, 27, 215 ; vol. v. p. 54 ; vol. vi. p. 96; 

 'Report on some Liassic Beds in Northamptonshire,' Report Brit. Assoc, 1S91, pp. 334-351- 



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