GREY LIMESTONE— HATAT. 53 



GypsiferoilS series. — Name applied by W. T. Loftus (Quart. Journ. 

 Geol, Sac. XL 254, 1855) to the Upper Tertiary rocks in Northern 

 Persia, and apparently including everything above the Nummu- 

 litics (i.e., Oligocene). According to G. E. Pilgrim (Mem., Geol. 

 Surv. Ind., XXXIV, 52, 1908), it can be separated into two series, 

 the Fars below and Bakhtiyari above, with a great unconformity 

 between. 



Haimanta system. — Named by C. L. Griesbach (Mem. Geol. Surv. 

 Ind., XXIII, 50, 1891) from the fact that this system of rocks is 

 largelv developed in the snowclad Central Himalayan mountains. 

 Used for all the strata in the Central Himalaya lying between 

 the crystalHnes (gneiss and Vaikritas) and the Lower Silurian. 

 Discarded by H. H. Hayden (Mem. Geol. Surv. Ind., XXXVI, 

 19, 1904) on determination of the age of the different divisions 

 of the system, the Middle and Upper Haimantas being Cam- 

 brian, the Lower Haimantas not being identified (Hayden, loc. 

 cit., p. 9). 



Hajigak limestone and hematite.— To the west and north-west of 

 Kabul in Afghanistan there occurs as a narrow band, running about 

 east-north-east to west-south-west, a series of beds composed of 

 hematite below, covered in turn by slate and limestone, the 

 hematite bed resting on the Kalu series. This composite form- 

 ation has been named by H. H. Hayden (Mem. Geol. Surv. Ind., 

 XXXIX, 24, 1911) from the Hajigak pass (34° 39' ; 68° 7') and 

 was regarded as Devonian from a preliminary determination of 

 the fossils in the limestones. F. R. Cowper Reed (Rec. Geol. 

 Surv. Ind., XLI, 103, 1911) finds that the fossils in the limestones 

 show an Upper Devonian age. 



Halorites limestone. — An Upper Triassic horizon exposed on the 

 southern slope of the Bambanag range above the Girthi valley 

 in the Central Himalaya of Kumaon has become generally so 

 known on account of the Ammonite, Halorites, being prominent 

 among the abundant fossils which it has yielded. According to 

 E. von Mojsisovics (Pal. Ind., Ser. XV, III, Pt. 1, 131) 

 this limestone can be correlated with the Lower Noric (Lacic) 

 stage of the Hallstatt limestone including, however, certain fossils 

 of Middle Noric (Alaunic) age. These conclusions are accepted 

 by C. Diener (Rec. Geol. Surv. Ind., XXXIV, 1, 1906). 



Hatat series. — Name proposed by G. E. Pilgrim (Mem. Geol. Surv. Ind., 

 XXXIV, 7, 8, 1908) for a series of mica schists, talc schists, and 



