42 University of Texas Bulletin 



Somewhat surprising is the occurrence of the new genus Lilinthi- 

 ceras with its complicate sculpture which, as Diener justly remarks, 

 recalls the upper Triassic Clionites; unfortunately the suture is only 

 imperfectly known. 



The remaining ammonoids have a rather archaic character; they 

 could very well come from the Upper Carboniferous. It is therefore 

 impossible to decide with any amount of certainty the exact age of the 

 Productus shales of Lilinthi. 



For a long time a controversy has been going on with regard to the 

 age of the Productus limestone of the Salt Range of India. Notwith- 

 standing the astonishing number of fossil species discovered in and 

 described from these strata, the most different opinions have been ex- 

 pressed with regard to their age. There is no necessity to enter into 



the details of this controversy as its history has been given by Fr. 

 NoetHng in his "Beitrage zur Geologic der Salt Range." 



The fossils of the Productus limestone were first regarded as Car- 

 boniferous (Verneuil, Davidson, Koninck) ; an opinion which was ac- 

 cepted by Wynne and, at first, also, by Waagen. Waagen, however, 

 little by little changed his views until at last he came to regard the 

 Speckled sandstone, the lower and part of the middle Productus lime- 

 stone (Katta beds) as the equivalent of the Permo-Carboniferous, 

 while the rest of the middle Productus limestone is considered as the 

 equivalent of the Rotliegendes and Weissliegendes (Virgal and Kala- 

 bagh beds), and the upper Productus limestone as the representative of 

 the rest of the Zechstein. 



Noetling gets to a somewhat different result. Like Waagen he be- 

 lieves that the Carboniferous does not exist in the Salt Range and 

 that the strata above the important unconformity on top of the Cam- 

 brian belong to the Permian. But he does not recognize the existence 

 of the Permo-Carboniferous in the Salt Range, and believes that only 

 the Rotliegendes or Penjabien, and Zechstein or Thuringien are re- 

 presented. He considers his three lower groups, the Talchir, Dandote 

 and Warcha groups, as representing the Rotliegendes; and the three 

 upper, i. e., the Amb, Virgal and Chideru group, as synchronous with 

 the Zechstein. The three lower groups correspond to Waagen's mid- 

 dle and lower Speckled sandstone, while the upper three groups are 

 the same as Waagen's Productus limestone ; the Amb group being the 



