72 M1DDLEMISS: PHYSICAL GEOLOGY OF SUB-HIMALAYA. 



is a dark grey-blue dolomitic limestone, with a few slaty bands ; and 

 altogether barren of fossils. The dip steepens a little towards its 

 northern boundary, becoming between 8o°and 90 . In the horizontal 

 section, No. VI, which is drawn due north and south, the apparent 

 dips are necessarily much less. The mesozoic Til beds do not 

 actually occur in the river section, owing to a cross-fault running nearly 

 E.N.E. — W.S.W., the line of displacement in the river-bed being just 

 such that the nummulitics on the north of the fault are in contact 

 with the massive limestone on the south of it. The mapping here 

 differs a little from that accompanying my paper in the Records. 1 

 Sufficient prominence there was not given to the fault in its west- 

 ward extension; and the nummulitics are represented as being folded 

 amongst the purple slates. I have since found out that what I took 

 to be purple slates on the south of the nummulitics are really 

 hardened beds of the latter stage, and that therefore their normal 

 position is directly above the Til beds, as is shown over the rest of 

 my former map. 



Although the Til beds do not appear in the river section, they 

 are prominently displayed on the two ridges on either side of the 

 Pelini river. It was on the western of these that I first found the 

 fossils which afterwards identified these beds with the original Til 

 beds of Mr. Medlicott, and gave their probable age as mesozoic. 

 They are composed in this locality, as elsewhere, of a hard grit and 

 sandstone with a few pebbly bands in their lower part, and of a cal- 

 careous grit or oolitic limestone, weathering an indigo-black colour 

 in their upper part. In the latter the fossils were obtained. I can 

 do no more here than refer to them thus briefly, as this memoir does 

 not concern them directly. Besides which consideration, a better 

 collection of the fossils must be obtained before any more definite 

 geological horizon can be assigned to them. The dips in the Til 

 beds coincide very nearly with those in the massive limestone below, 

 and the nummulitics above ; that is to say, they are very steep, 

 averaging between 70 and 8o°, though in the horizontal section this 

 1 Records, G. S. I., Vol. XX, p. 26. 

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