SEC. 10.] NORTH-WESTEEN KTITCH. 221 



pass laterally iato thin bedded, dark, flaggy shale having in many places 

 a bright yellow- efflorescence exuding from between the layers. This 

 passage of a thin bedded into an apparently but slightly stratified 

 deposit may illustrate the possibility of many such lateral changes which 

 from the difficulty of tracing out separate beds have often been 

 suspected to affect the Jurassic rocks of Kutch. Light-colored and 

 red sandstones with highly ferruginous layers, full of annelid tracks, 

 prevail in this neighbourhood. 



Northwards from this on the further side of the intrusive trap 



ridge, a valley is reached which opens on the 

 Country near Jumara, 

 north of the large trap Runn. Here near the intrusion, very strong, coarse 

 intrusion. •10 



white sandstone, of the aspect of the upper series, 



associated with greenish flaggy layers, and perhaps let down by a fault 

 coinciding with the intrusion, overlies a strong band of black shales, in 

 which were found some plant-fragments and a few casts of an 

 extremely thin bivalve shell, evidently a species of Gorimya, unfortunately 

 not determinable ; but the shale was so tender and the shell so thin 

 that specimens were difficult to obtain. In some green flaggy layers 

 narrow winding tracks, probably molluscan, were observed. 



Some light gray sandstones in this strong shale band are full of 

 brecciated shale fragments, and near the base of the zone are black, 

 blue, and gray earthy sandstones, with rusty and coarse white beds. At 

 one place in this zone a local unconformity, or what is more likely, oblique 

 lamination on a large scale, interrupts the regular stratification of massive 

 beds of dark sandstone, with shale partings and layers, the beds in a 

 river cliff, 30 feet high, appearing to thin out against the ends of others 

 of quite similar kind. 



Further north, beyond the village of Jumara, a dome-shaped arrange- 



_ .,.. , , ment of the lower beds on some slightly rising 



Fossihferous and cal- o j o 



careous zone. ground brings to the surface the fossiliferous zone 



( 221 ) 



