A DESCRIPTION 



OF THE 



TERTIAEY FOSSIL EOHINOIDEA 



OF 



KACHH AND KATTYWAR. 



I. BemarJcs on the Geology of Kachh in Relation to that of Sind and Kattywar. 

 By W. T. Blanfokd, F.E.S., late of the Geological Survey of India. 



My friend Professor P. Martin Duncan has asked me to write a few lines on the 

 Tertiary rocks of Cutch (Kutch or Kachh) and their connexion with the corresponding 

 formations of Sind, as an introduction to the description of the Cutch Tertiary Echi- 

 noidea. I have much pleasure in aiding so far as I am able in explaining the relations 

 of the beds ; and I find that some explanation is necessary, owing to the terms applied 

 to the Kachh groups by Mr. Wynne, and adopted in the 'Manual of the Geology of 

 India ' byMedlicott and Blanford, having been applied in a somewhat different sense 

 by Mr. Fedden in the lists of localities sent with the fossils now described. 



Before proceeding to details, it will be useful to notice the general characters and 

 position of the Cutch Tertiary rocks, their connexion with the formations of the same 

 age in Sind, Kattywar, &c., and the accounts given of them by different observers. 



Kachh, or Cutch, it is scarcely necessary to say, is a district lying east of the mouths 

 of the Indus, and surrounded on three sides by a flat marshy plain called Ran, and 

 composed of alluvial deposits, the fourth or south side bordering the sea and the Gulf 

 of Cutch. The Tertiary rocks occupy a belt, varying in breadth from about 4 miles to 

 20, between the alluvium near the coast and the older Mesozoic rocks in the interior. 

 The Tertiary belt laps round the older rocks to the westward, where the whole of the 

 Tertiary series is best exposed, and a few outliers occur even north of the Mesozoic 



area. 



B 



