58 [part I. 



Chapter VI. — The Stratified Traps. 



These rocks occupy a large portion of the districtj forming all the 

 hilly ground nearest to the sea and stretching in 



Distribution. 



a broad belt from Anjar to the western side of 



the province. They also appear in outlying patches^ some of which 



extend further east than Anjar, but they do not recur in the Wagir 



tractj nor have they been found on any of the islands in the Runn. 



The trap belt is broadest where most southerly, becoming irregularly 



indented and narrower as it trends to the north-west (the indentations 



sometimes breaking its connexion for short distances), but spreading 



over a large space where it terminates in the Gaira hills. 



The beds or flows rest, as a rule, upon the Jurassic rocks with 



complete unconformity, though in many eases 

 Unconformity. 



this is but slightly apparent owing to the low 



southerly dip common to both formations. 



The rocks consist of the usual gray, greenish olive and dark coloured 



doleritic, frequently amygdaloidal, or basaltic traps 



Varieties. 



of the Deecan formation. They contain some similar 

 zeolites coated with green-earth, the characteristic white agates, red boley 

 layers, and beds of concretionary or columnar structure, the latter often 

 magnetic ; some flows are rendered porphyritie by glassy felspar crystals, 

 some are greatly decomposed, and all are, as a group, identical with 

 the Deecan traps, believed to be of very early tertiary age. 



The lower flows are frequently thick, and zeolitic or sometimes ill- 

 defined ; and not far above the base some thick 



Intertrappean beds. i i i • i n j. i,i i 



red sandstone is locally present : or earthy calcareous 



beds are interstratified which contain the well known P/i?/sa Frinsepii 



and a few other fossils. "While sinuosity in the outline of the 



lower boundary might be expected from the unconformity which there 



( 58 ) 



