Arkell.1956.Jurassic..

UPPER CALLOVIAN
RUSSIA 487
Lamberti Zone. Records of Q. lamberti and Q. leachi (= vertumnum)
(p. 63) indicate that this zone is represented at ChutOr Sawodski, as does
the figure of Kosmoceras aff. spinosum (Sow.) (pi. iii, fig. 16).
Athleta Zone. Presumably of this date are the Peltoceras beds of
Beryesowi Ravine, with Peltoceras s.s. aff. athleta (pi. iii, fig. 4), inner
whorls of Peltoceratoides or Parawedekindia (pi. iii, fig. 5), and IRursiceras
(pi. iii, fig. 3).
MIDDLE CALLOVIAN
Both Erymnoceras cf. coronatum and Kosmoceras jason are recorded
(Borissjak, 1908, p. 74; Makridin, 1951).
LOWER CALLOVIAN
The foregoing Callovian and Oxfordian beds record an advance of the
limestone facies and retreat of sandstones towards the east and southeast
as the Palaeozoic shoreline retreated in that direction (Borissjak,
1908, p. 91). The first truly marine beds were thought by Makridin
(1951) to begin with the Calloviense Zone. Below this come thick coarse
sandstones which pass up diachronically, as just stated, into the Callovian
clays; they are supposed to represent the Lower Callovian.
BATHONIAN
Underlying the sandstones are clays with plant-remains. In some
places equivalents of these beds contain Pseudocosmoceras michalskii
Borissjak sp. and other Parkinsonidae, some belonging to the wiirttembergica
group (Mourachkine, 1930). Clays assigned to the Bathonian
and Callovian also occur as far west as Kiev (Chirvinsky, 1937, p. 87).
UPPER BAJOCIAN
The lower part of the same clay formation contains irony concretions
from which have been obtained Parkinsonia, Spiroceras, Garantiana
and Strenoceras (Borissjak, 1908, p. 88 and figs.). The lithological,
stratigraphical and palaeontological similarities to Algeria (Ghar Rouban
mountains) are most striking.
MIDDLE AND LOWER BAJOCIAN
This is represented by a bed of conglomerate with belemnites and
Dorsetensia rossica, isjumica, and kamenka (pi. ii, figs. 5-12), which Borissjak
was inclined to correlate with the Humphriesianum Zone, overlying beds
with Leioceras.
TOARCIAN
Hammatoceras cf. insigne (pi. i, fig. 14) indicates the Jurense Zone.
The earliest marine fauna in the Donetz is typical of the Falcifer and
Commune Zones, with Hildoceras and Dactylioceras (Borissjak, 1908,
p. 88, and pis. i, ii, iii).
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