Farthest North, Vol. II: Being the Record of a Voyage of Exploration of the Ship 'Fram' 1893-1896Nansen, Fridtjof
History
Farthest North, Vol. II: Being the Record of a Voyage of Exploration of the Ship 'Fram' 1893-1896
Nansen, Fridtjof
"Fram" Expedition (1893-1896); Arctic regions
This species has since been found by me in 1882 in the Upper
Jurassic strata of Spitzbergen. The leaves remind one of the leaves
of the subspecies nageia of the existing genus Podocarpus.
"The finest specimens of the whole collection are the leaves of a small
Gingko, of which one is complete (Fig. 6). This genus, with plum-like
seeds and with leaves which, unlike those of other pine-trees, have
a real leaf-blade, is found at present, in one single species only,
in Japan, but existed in former times in numerous forms and in many
regions. During the Jurassic period it flourished especially in East
Siberia, and has also been found on Spitzbergen, in East Greenland
(at Scoresby Sound), and at many places in Europe, etc. During the
Cretaceous and the Tertiary periods it was still found on the west
coast of Greenland at 70° north latitude. The leaf here reproduced
belongs to a new species, which might be called Gingko polaris, and
which is most closely related to the G. flabellata (Heer) from the
Jurassic strata of Siberia. It bears a certain habitual resemblance
to Gingko digitata (Lindley and Hutton), particularly as found in
the brown Jurassic strata of England and Spitzbergen; but its leaves
are considerably smaller. Besides this species, one or two others may
also occur in this collection, as well as fragments of the leaves of
the genus Czekanowskia, related to the Gingko family, but with narrow
leaf-blades resembling pine-needles.
"Ferns are very scantily represented. Such fragments as there are
belong to four different types; but the species can scarcely be
determined. One fragment belongs to the genus Cladophlebis, common
in Jurassic strata; another suggests the Thyrsopteris, found in the
Jurassic strata of East Siberia and of England; a third suggests the
Onychiopsis characteristic of the Upper Jurassic strata. The fourth,
again, seems to be closely related to the Asplenium (Petruschinense),
which Heer has described, found in the Siberian Jurassic strata. The
specimen is remarkable from the fact that the epidermis cells of the
leaf have left a clear impression on the rock.
"With its wealth of pine leaves, its poverty of ferns, and its
lack of Cycadaceæ, this Franz Josef Land flora has somewhat the same
character as that of the Upper Jurassic flora of Spitzbergen, although
the species are somewhat different. Like the Spitzbergen flora, it
does not indicate a particularly genial climate, although doubtless
enormously more so than that of the present day. The deposits must
doubtless have occurred in the neighborhood of a pine forest. So far as
the specimens enable one to judge, the flora seems to belong rather to
the Upper (White) Jurassic system than to the Middle (Brown) system."
Public-domain text, read in full here on John Shaqi.
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