456 PROCEEDINGS OF THE ACADEMY OF [1897. 



(4) Brownish and yellow clay with a bed of limestone (Oppelia, 

 Perisphinctes) determined as a zone of Hoplites of the Kim- 

 meridgian. 



(5) Sandstone of the lower Callovian and conglomerates with 

 Cosmoceras Goiueri, Cadoceras sublceve, some forms of Peri- 

 sphinctes, accompanied by Belemnites, Protocardium, Con- 

 cinnum, etc. 



(6) Gray clays of the gypsiferous lower Callovian, with prints of 

 Cadoceras. 



(7) Variously colored marls. 



(8) Sands and conglomerates with subordinate marls. 



(9) Marls interstratified with limestone. 



Issady — Nijni-Novgorod. — Among the outcrops on the old right 

 bank, between the landing places of Issady and Nijni-Novgorod, 

 that below Takinsky deserves especial attention, on account of the 

 appearance of the middle and lower horizons of the marly and 

 sandy Permian rocks, notably the series Q — marly, D — arenaceous 

 marly, E — marly calcareous. 



Nijni-Novgorod. — The city is situated on the high and rather steep 

 right slope of the valley, at the confluence of the Volga with the 

 Oka. On the side of the Volga the slope is partly covered with 

 vegetation, partly with buildings, debris, etc. On the Oka side, on 

 the contrary, fine outcrops permit one to see the structure. Two sec- 

 tions are especially characteristic : the first in the banks of the river 

 Yarilo and the other in the ravine near the camp. The first of these 

 sections is seen near the town opposite the steamboat landing of the 

 Oka, in the great ravine of the Yarilo. The section is as follows: 



Post-pliocene, yellow lotssoid, sandy argillaceous clay with a very 

 few marly and a few pebble inclusions. 



Permian deposits : 



A. Marls imperfectly visible in the right slope. 



B. Thick bed of sand, sandstones and conglomerates, with sub- 

 ordinate beds of marls. In the left slope the conglomerate 

 of this horizon contains casts of Palceomutela. 



C. Thick deposits of variously colored marls interstratified with . 

 limestones and many beds of sands and sandstones. 



Between the upper layers of this bed there is a thin layer of 

 much disintegrated limestone, containing numerous perfectly pre- 

 served shells of various Anthracosidai, especially the groups Palozo- 

 muiela key ser liny i, Palaioanodonta Jischeri and Oligodon. These 



