Arkell.1956.Jurassic..

526 GREENLAND
UPPER OXFORDIAN (270 m.)
At top of the Oxfordian is the Pecten Sandstone (70 m.), with rare
ammonites; so far only Amoeboceras (Prionodoceras) aff. alternoides (Nik.)
and A. (P.) superstes (Buckman non Phil.) have been figured (Spath, 1935,
pi. i, figs. 2, 4).
Below follow 200 m. of sandy, micaceous shales with layers of concretions.
From 'a few metres' below the top were collected Ringsteadia
FIG. 83.—Sketch-map to show the Jurassic outcrops of East Greenland. After
Koch, 1950.
sp. indet., Amoeboceras (Prionodoceras) aff. pseudocaelatum Spath and A.
(P.) transitorium Spath. Both these assemblages are of the date of the
Decipiens and Pseudocordata Zones.
From somewhere in these shales (presumably lower down) was collected
Cardioceras (Subvertebriceras) aff. zenaidae Ilov. (Spath, 1935, pi. ii,
fig. 3), which is the sole representative of the Plicatilis Zone. Perhaps of
the same date is a Cardioceras from Jameson Land recorded as C. caelatum
Pavlow (ibid., pp. 74, 75).
UNDATED (200 m.)
In Milne Land no earlier Jurassic zones have been proved; under the
Cardioceras Shales is the Charcot Bay Sandstone (200 m.), which is
unfossiliferous and rests with basal conglomerate directly on ancient
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