42 Transactions. 



Two exposures of Tertiaries are recorded for the first time from this 

 district — (1) that in Coal River, and (2) that occurring on the western side 

 of the Maeaulay River on the Sibbald Range. 



(1.) Coal River. — Exposures of sands and clays with coal occur in several 

 places in the deep gorge which Coal River has incised in the down country 

 to the north-east of the lake, and chiefly in the vicinity of the right-angle 

 bend which the stream makes as it leaves the Richmond Range and 

 runs straight to the north-eastern corner of the lake. The exposures, 

 five in number, occur in places along the two miles of gorge stretching both 

 above and below the bend, but they are so masked by moraine that they 

 cannot be traced away from the stream, and the relations of the individual 

 outcrops to each other are obscure. The exposure lowest in the course 

 of the stream is distant about three miles from the road-crossing. Here 

 are exposed greyish-white sands of uncertain thickness, capped by gravels, 

 brownish owing to the presence of iron-oxide, which are apparently uncon- 

 formable ; above them lies morainic matter. 



On the north side of the river, at the bend, occur sands and sandy clays 

 weathering white or stained brown. The strike is appaiently N. 10° W., 

 and the dip to the east 35°, but there is some doubt about this observation. 

 On the south side of the river, about 100 yards up-stream, are sandy clays 

 with carbonaceous shales ; and farther up still, at the mouth of a small 

 creek coming from the Richmond Range, there is a patch of much-slipped 

 country showing sands and sandy clays, some with distinct greenish tint. 



After the intervention of a barrier of greywacke, capped in places by 

 white sands, similar beds to those just mentioned occur nearly a mile 

 up-stream on the south side. The following sequence occurs here, in 

 ascending order: (1) White sandy clay, 4ft.; (2) clays with reddish 

 tinge, 8 ft. ; (3) impure lignite, with carbonaceous shale, 2 ft. 6 in. ; 

 (4) argillaceous sands, stained brown in the lower part, yellow above, 

 15 ft. ; (5) whitish sands, thickness uncertain. These are capped by 

 brownish gravels, which may be conformable, but the exposure is so 

 limited that it cannot be determined for certain These are succeeded 

 unconformable by moraine. 



The strike of the beds is north, with a dip to the east of 45°. This 

 patch of sedimentaries has a fault-contact on the south-east margin with 

 the older beds, the fault running north-east and south-west, and its 

 continuation may account for the presence of the beds in the bend of the 

 creek, as their south-eastern border has the same line as the fault. This 

 patch owes its preservation, in all probability, to having been faulted down, 

 and having thus been preserved from erosive agents. How far it extends 

 under the morainic material to the north and south of the river is quite 

 uncertain, but brown gravels similar to those occurring near the stream 

 are exposed farther north on the western slope of Mount Gerald, which 

 suggests a continuation of the beds in that direction. 



(2.) Stony Creek Beds. — These beds lie on the floor of a corrie on the 

 western side of the Maeaulay Valley, which is drained by Stony Creek. 

 They lie about 4,000 ft. above the sea. There are two occurrences, sepa- 

 rated by a barrier of greywacke. The lower one consists of the following 

 beds, in ascending order : (1) White argillaceous sand ; (2) greenish sandy 

 clay ; (3) brown coal, 2 ft. 6 in. thick, striking north and south, and 

 dipping west 35° (the coal contains pieces of ambrite) ; (4) whitish sand, 

 with yellow stain ; (5) white sand, very fine in grain, with small amount 

 of clay ; (6) grey sandy clay. 



