1840.] 



On the Geology of Cuich. 



319 



fined to two species, one of which differs so very little from T. costata of 

 the lower oolites of England, that Mr. Sowerby considers it only a varie- 

 ty of that fossil. The genus Pholadomya also abounds, but the speci- 

 mens are generally broken. Of the three species I collected, Mr. Sower- 

 by has not been able to establish an identity with any known Pholadomya 

 in England, although there is a general resemblance to the oolitic and 

 lias fossils. I found two species of Belemnites, one of which resembles 

 B. canaliculatus of the inferior oolite ; the other is not determinable. 

 Of the species of oysters, one resembles the Odrea Marshii of the En- 

 glish cornbrash. I found it in a bank high up the Katrore hill, in the 

 Charwar range, in friable, laminated strata of slate-clay and sandstone 

 slate, associated with Ammonites of the same description as those at 

 Charee and along the Runn'^ I did not find a single specimen of a Gry 

 phaea, although numbers of the genus have been collected from this pro- 

 vince. Some crinoidal sterns, which I collected from the same localities 

 resemble those of a species found in the mountain limestone ; but as the 

 fossils above enumerated characterize the middle series of the English up- 

 per secondary rocks, fossils belonging to so much older a formation can 

 hardly be associated with them. These crinoidal remains, therefore, pro- 

 bably belong to an undescribed species. The only fossil bone which 

 I discovered, Messrs. Clift and Owen consider to be a caudal vertebra of a 

 Saurian. This determination is, however, very interesting, as it shows 

 how widely these animals were distributed; being, in this distant country, 

 also associated with the same mollusca (one valve of a Trigonia costata 

 is imbedded in the m.ass containing the bone) as accompany their remains 

 in the English strata. 



In the Appendix to this paper I have given a complete and systematic 

 list of all these fossils, stating the localities where I collected them. 



General Shape of the Hills belonging to this Formation. —'Miiny of the 

 hills in Cutch present, on the north side, a perpendicular cliff surmount- 

 ing a sloping talus, and on the south an inclined plane ; and they owe 

 this peculiar eutline to their being composed of a base of laminated clay 

 or sandstone, capped by a thick bed of coarse and brittle sandstone. 

 This is particularly the casein the Jarra hill, and the hills of Hubbye, 

 Lodye, andRoha-ke-Koss, near the village of Joorun, on the Runn ; also 

 those of the Puclmm and Khureer islands in the Runn, particularly the 



♦ At the base of these hUls, and fotming the immediate borders of the Runn, fossil 

 shells are found of a very different description, amonj? which I maj^ enumerate Cardium, 

 Pecien, Corbula, Fenus, Globulus, and vast quantities of Turritclla \ which last form 

 large masses of rock protruding every here and tliere above the bed of the Rwnn. 



