102 . WYNNE : GEOLOGY OF KUTCH. [PART II. 



of Dorwar village. In the fragmentary shell bands badly preserved 

 Modiola and Meli?ia occur ^ in thick sbaly bands numbers of Corhula, 

 some Terehratidm, large gray blocks of fossil woodj and from the strong 

 beds which form the crest of the hill a few small scattered fish teeth 

 were obtained. Many of the species from these places are identical with 

 forms found among the lower beds in the islands to the east. Ntocula 

 flags occur near Undoo, and a few purple conglomeritic sandstones con- 

 tain Astarte, Modiola, and oysters. 



The whole of these marine fossil-bearing beds have been referred 

 to the lower division of the Kutch Jurassic rocks. 



A margin of low ground of no great width, but narrowest where 

 the mountains rise most steeply from the Runn, 



Margin of the island. i i t. i 



surrounds the Putehum isle. In this low ground^ 

 overlapping and wrapping round the jurassies on the west and south, are 

 sheets of hoematitic laterite, sometimes accompanied by its usually 

 associated earthy rocks and beds resembling volcanic ash, the whole 

 dipping from the higher ground at angles of 5° and less. 



As usual, the unconformity of this group of laterite sub-tertiary 

 rocks to those below is but slightly, if at all, 



Sul)-tei'tiary. 



apparent ; but to the east of Kaora near Raimulrow 

 hill foot, this group rests upon smooth gray gypseous . shales with red 

 bole and purplish layers belonging to the Jurassic formation. There 

 are also bands thickly studded with casts of bivalve shells of remarkably 

 thin structure, together with fragments of planulate Ammonites. The 

 dip of both rocks here is to the south-west, but as these shales are not 

 always to be seen in the same position, and the lateritic group rests 

 indifi'erently upon other rocks of Jurassic age, the unconformity may be 

 inferred. 



Overlying the laterite north-west of Dinara is some rugged white 

 kunkury rock without fossils, but at the village of Drobana, brown rusty 



( loa ) 



