﻿Fig.«4. — Vertical section of the JLugar Sill, on the scale of 

 22-5 feet to the inch. 



2-bQ 



2-86 

 2-75 



Sandst one 



2.64 



2-34 

 2-92 



2-92 



2- 96 



3- oo 



2.99 



.vtm; 



•1. is 



\ '- 



3-oo 



3-oi 



2- 8l 



2.77 

 2.76 



2-80 



\\\ ^ / N <\ \ / \ \ 



y/>_V^//i/ //</// 

 f,i 1 f)f it. ) 



Sandstone 



Teschenite-basalt. 

 (Upper contact-faeies.) 



Upper tesehenife, with analcite- 

 rich facies at the base. 



Sharp contact. 



Theralite : patches of anaicitic 

 material at the ton. 



Picrite : increasing density of clots 

 ► represents downward concentra- 

 tion of olivine. 



Lugarite. 



Peridotite. 



Assumed sharp contact : not seeni 

 in the field. 



Lower teschenite. 



Teschenite-basalt. 

 (Lower contact-facies.) 



[Figures on the left-hand side represent the specific gravities of the rocks 

 collected approximately at the points indicated. The curve shows the 

 variation of specific gravity with depth in the sill : the z : gzags at the top 

 are due to the alternation of schlieren of different densities. The broken- 

 line curve shows the effect of averaging these variations. The division, 

 of the sill into three sharply-defined parts is well marked.] 



