RECORDS 
OF THE 
GEOLOGICAL SURVEY OP INDIA. 
Part 4.] 1871 . [November. 
Abstract or results op examination op the Ammonite-fauna of Kutch, with 
REMARKS ON THEIR DISTRIBUTION AMONG THE BEDS, AND PROBABLE AGE, by WlLLIAM 
Waagen, Ph. D., Geological Survey of India. 
In preparing for the “ Palseontologia Indica” a monograph of the fossil Cephalopoda 
and in particular of the Ammonitidas, represented in the Kutch Jura, I have obtained some 
general results, which may be interesting to notice in connection with the study of the 
jurassic deposits in that province. 
The Cephalopoda seem rather common in all the principal jurassic strata of Kutch, 
excepting in the lowest beds, which have as yet furnished only some Gastropods, a great 
number of Pelecypods, besides some undeterminable fragments of Belemnites and a few 
other fossils. 
The number of species of Ammonites collected by Messrs. Blanford, Wynne, and Fedden 
in the course of a few working seasons, amounts to about 80, of which number, however, all 
are not in a sufficiently good state of preservation to allow of accurate determination. 
According to the different genera, which have been lately distinguished in supercession of 
the old genus “ Ammonites the Mowing are represented in the Kutch Jura: 5 species of 
Phylloceras, 2 of lytoceras. 1 JIaploceras, G Oppelia, G Rarpoceras, 7 Peltoceras, (n. g.) 
4 Aspi&oceras, 17 Stepianoceras, and about 32 Pensphinctes. If we inquire into the geo¬ 
logical distribution of those genera in the Europeau jnrassic districts, we will find that the 
Phylloceras and Lytoceras are not limited to certain strata of the jurassic formation, but 
begin in the Trias, and extend without any interruption into the middle, and even upper 
layers of the Cretaceous period. Haploceras, on the contrary, occurs within narrower limits 
appearing solitary for the first time in the Bathonian, and disappearing again in the lowest 
beds of the Neocomian, its principal development being in the Tithonian group. Of the 
genus Oppelia the greatest number of species is found in Oxfordian and Kimmeridgian 
beds, furnishing only a few sporadic species in lower strata, and beginning in the Inferior 
Oolite. Rarpoceras is characteristic for the Lias, but extends, however, in well developed 
forms up into the Oxfordian, and even into the Kimmeridgian group. Peltoceras is 
chiefly an Oxfordian, Aspidoceras chiefly a Kimmeridgian and a Tithonian genus. 
Stephanoceras occurs through the whole Jura, whilst Perisphinctes, represented by a larger 
number of species and specimens than any of the other genera, is mostly characteristic for 
the Upper Jura. 
If we now consider the number of species, by which every single genus is represented 
in the Kutch J ura, the simple comparison of the numbers before given, with the facts known 
regarding the geological position of the genera in Europe as stated above, will show us 
