50 



MIDDLEMISS: THE GEOLOGY Of [DAB STATE. 



The rocks, as here exposed, and as also beautifully seen in the 



crorffe of the Sai River about I. 1 , miles above 



Field relations of the w here it joins the Sabarmati, are a dark grey, 



Amnhibolitt'S. ,, v ■ i . IT 



rather line to medium-framed crystalline 

 limestone, as a basis, in which are developed very closely packed, 

 thin, parallel layers of basic hornblende-bearing rocks of a very 

 line grain, the origin of which is not very clear. They have not 

 the typical aspect of epidiorites, but closely resemble in many 

 particulars the amphibolites described by Adams and Barlow 1 in 

 Canada. The amphibolite layers are frequently very thin, from 

 ! inch to 1 or 2 inches across, and these, again are banded in still 

 liner parallel layers of varying tints of greenish-grey and black, 

 arranged parallel with the banding or bedding of the limestone, so 

 that in a single hand-specimen of the rook one may have a number 

 of these bands present. In the main river-bed at Kherod and in 

 the o-orge in the Sai river, they are praotioally vertical as regards 

 this banding or bedding, but nearer towards the cale-gneiss they 

 appear to underlie the latter with a dip of about 60' S.E. They 

 sometimes have a contorted or gnarled aspect. As regards 

 their typical dark colour and compact structure, as well as the 

 general absence from them of the white aplite veins, they contrast 

 very noticeably with the paler and more coarsely crystalline calc- 

 miciss In the Sai SOTffe there are exposures of vertical dill's of bare 

 rock, 50 to 60 feet high, with the regular and close interbanding 

 of the. amphibolite with the limestone as shown in the sketches 

 (see text figs. 7 and 8). 



1M 



T t 



U 



Limestone 

 'AmpJu'boIite 



River-bed 



6 on 



1 Geology of Haliburton and Bancroft areas, Ontario ; Dep. of Mines, Gcoi. Sur. 

 Branch, Mem. No. 6, 1910, p. L37. 



