88 WYNNE : TRANS-INDUS SALT REGION, KOHAT DISTRICT. 



From the vicinity of the old salt-mines above mentioned, this gyp- 

 sum stretches eastward between two bands of the 



Gypsum. 



limestone to a point due north of Ismail Khel, 



its general arrangement being that shown in the sketch section (Fig. 7), 



crossing the ridge, where the latter is compara- 

 Section. 



tively low, north by west from the last named 



village. The numbers are as follow: — 1. Gypseous series. 2. Red 

 clay zone. 3. Talus debris and concealment. 4. Nummulitic lime- 

 stone series. 5. Tertiary sandstone and clay series. 



Inverted ordex. Natural order. 



a.— Purple sandstone. 

 b. c— Purple and gray pseudo-conglomerate in red 

 clays, (Murree beds), calcareous. 

 d. — Alveolina limestone, 

 c. — Green gypseous clay with hard gypseous 



layers, vertical. 

 /.—Strong, flaky, solid, white gypsum. 

 <7.— Pale-greenish clay, with hard lime bands (h). 



o. — Purple and gray sandstone and red clays 



(Murree beds), 

 n. — Hard dun and whitish alveolina limestone or 



marble. 

 m.— Red clay, very red above, purple and red with 



sandy ferrugiDous layers (?) below. 

 Tc. — Solid gypsum, reddish and flaggy above with 



black bituminous layers. 

 j. — Grayish-green clay. 

 Strong white gypsum. 



This section is one of many which may be found in the country — 

 Dis aritv of the od showing but an inadequate representation of the 

 posite sides of section. former state of things. The double band of lime- 

 stone with the gypsum between is a broad fact consonant with the 

 structure of other places, but between these limestones the section, 

 though rather well exposed, remains obscure, so that it is difficult to say 

 where the axis of curvature may be. The red clay zone below the 

 nummulitic limestone is strongly displayed to the north, (as in the pre- 

 ceding section), but what there may be of it to the south is concealed, 

 and the nummulitic limestone itself is apparently thicker at the north 

 than at the south exposure. If room for these beds to thin out to some 

 extent over the curve (the distance across which is only about half a 

 mile) be supposed, the difficulty would become less, but in its centre, 

 where the bands on opposite sides would be much nearer each other, an 

 even greater disparity is found, the gypsum and clay alternations not 

 answering to each other. Crushing, compression and tension or traction 

 ( 192 ) 



