Arkell.1956.Jurassic..

524
GREENLAND
Micaceous shale with Praetollia maynci and P. aberrans Spath (1952)
9 m.+ without ammonites
Basal conglomerate with Subcraspedites afF. preplicomphalus Swinnerton
and S. (Paracraspedites) aff. spasskensis (Nikitin), also derived
Stschurovskya spp. (= 'Laugeites') and other Portlandian ammonites
(10 m.)
20 m. of shales and sandstones without ammonites
The Subcraspedites zone also occurs in Jameson Land and Milne Land.
It correlates with the Ryazan Beds and the Spilsby Sandstone, which
latter likewise contains derived Portlandian ammonites. In Milne Land
it is the highest fauna found in the Hartzfjaeld Sandstone, which is 330 m.
thick and ends with 100 m. of Cretaceous plant-beds of uncertain date
(Aldinger, 1935, p. 51).]
UPPER VOLGIAN (80-90 m.)
Most of the upper part of the Hartzfjaeld Sandstone probably belongs
to the Upper Volgian. From it have been obtained, in Milne Land,
Craspedites leptus Spath and C. ferrugineus Spath (1936, p. 85): species
represented by small and poorly-preserved material, not identical with
anything known from the Russian Volgian. At one locality, associated
with a small fragment of a Craspedites, was found a fragment of a large
ammonite body-chamber compared to Titanites; but considering the many
contradictions and uncertainties revealed by study of the Milne Land
collections (Spath, 1936, p. 142) and that this 'doubtful fragment' (ibid.,
p. 162) was 'loose' (p. 68) and that 'specific identification is, of course, out
of the question' (p. 67), no reliance can be placed upon it as to the mutual
stratigraphical relations of Titanites and Craspedites. No other Upper
Portlandian ammonite was found in Greenland (ibid., p. 162).
LOWER VOLGIAN AND PORTLANDIAN (125 m.+)
The Lingula Bed near the middle of the Hartzfjaeld Sandstone (70 m.
above the base) has yielded the genus Stschurovskya Uov. & Flor. 1941
(= 'Kochina' Spath, 1936, preocc, = 'Laugeites' Spath, 1947) belonging
to a species (S. groenlandica Spath sp. 1936, p. 82) close to the type species
of the genus, S. stschurowskii (Nik.), of the Russian Lower Volgian. Beneath
come 70 m. of unfossiliferous Hartzfjaeld Sandstone, then 20-30 m. of
sandy shales with Dorsoplanites gracilis Spath and forms of the Gorei
Zone of the upper Portland Sand, assigned variously to Glaucolithites
Buckman and Crendonites Buckman (by Spath to the latter; 1936, p. 62).
Some of them are described as 'almost indistinguishable' from English
ammonites of the group of G. gorei, but all are assigned to new species.
This assemblage can be dated confidently to the Gorei Zone of the Lower
Portlandian.
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