Arkell.1956.Jurassic..

RUSSIA 405
(1897, p. 16) or Pavlow (1897, p. 26) from the Virgatus Zone. J. F. Blake,
however, who took part in the Congress excursion of 1897, collected and
brought home from this locality ammonites which Spath (1923, p. 307)
was able to identify as Subplanites. The occurrence of Subplanites in SE.
FIG. 78.—Section at Kashpur on the Volga, after Pavlow, 1897.
N. Neocomian.
N.SMB. Black clay with Simbirskites versicolor.
N.SQ. Friable greenish-grey sandstone with Belemnites subquadratus (1 m.) and shaly
grey clay, more or less sandy and poorly fossiliferous (2-3 m.).
N.PL. Phosphatic conglomerate (o -
2 m.) and yellow sand (o -
25 m.) with Polyptychites
keyserlingi,
spp.
P. gravesiformis, P. beani, Belemnites lateralis, B. subquadratus, Buchia
N.VG. Friable sandstone and conglomerate of fossils (0-9 m.) with Subcraspedites
spasskensis, Buchia spp. and belemnites as in N.PL.
AQ. Aquilonian (= Upper Volgian). Undated green sand (0-25 m.).
AQ.K. Marl passing into sand and into a dense mass of fossils (1 m.): Craspedites
kaschpuricus,
fischeri, etc.
Garniericeras subclypeiforme, Belemnites lateralis, B. russiensis, Buchia
AQ.S. Grey glauconitic and sandy marl (3 m.). Craspedites subditus, C. okensis, C.
catenulatus, same belemnites and Buchia fischeri, etc.
PT. Portlandian (= Lower Volgian).
PT.G. Sandy marl and green sandstone with phosphatic nodules (o -
7 m.). 'Ammonites
of the group of A. giganteus, A. triplicatus' (= Blakei Zone).
PT.V. Phosphatic conglomerate, bituminous shales, and grey clays with Virgatites
virgatus, Belemnites absolutus, etc. (3 m.).
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