DU NOYER — NOTES ON THE GIANT's CAUSEWAY. 



13 



sequently in them we have regained the same geological horizon or 

 the beds equivalent to those forming the hose of the Chimney- 

 headland. 



From the foregoing 

 remarks we may infer 



1st, That lava-flows 

 are mnch less regular 

 and parallel to each 

 other in their deposition 

 than matter deposited to 

 form an aqueous rock. 



2nd, The Basalt which 

 forms the columnar bed 

 known as the " Giant's 

 Causeway" is quite a 

 local deposit, measuring 

 at the most two thou- 

 sand six hundred feet in 

 width, or from east to 

 west, and appearing 

 along the coast as a len- 

 ticular shaped bed, thin- 

 ning out at either side ; 

 and it occupies a flat- 

 tened trough in the 

 amorphous basalts which 

 underlie the great ochre- 

 bed of the " Chimney-" 

 headland. 



3rd, The section af- 

 forded by the coast ad- 

 joining the Causeway is 

 a cutting- transverse to 



Lign. 

 Figs. 1 and 2, 



-Grouping of Basaltic columns. 



Three sided columns sun-ounded by their 



the longest axis of, at associated pillars. Fig. 3.— The largest perfect column at 

 the Causeway ; a nonagon surrounded by its adjoining 

 least, this lava-flow. pillars. Fig. 4.— Possibly a decagon column, sun-ounded 



hj nine other columns. It may, however, be merely a hex- 

 4th, The columns of ago^i. ^^^^ ^ heptagon attached by one side longer than the 

 others— no means of proving whether the central division 

 this particular bed ap- prolonged below the articulation of the pillar shown in 

 ^ ^ the view. 



