(Eifelien). |
E \ +---------------+-----------------+-----------------+------------------+-----------------------------+
/ | | | | Limestones and slates of |
L | | | | | the Yuresan and Ufa rivers,|
O | | Absent. | | | slate and quartzite, |
W < | | | | marble of Byclaya and |
E | | | | | of Bogoslovsk, phyllitic |
R | | | | | schists and quartzite. |
\ +---------------+-----------------+-----------------+------------------+-----------------------------+

The Lower Devonian of the Harz contains a fauna which is very
different from that of the Rhenish region; to this facies the name
"Hercynian" has been applied, and the correlation of the strata has
been a source of prolonged discussion among continental geologists. A
similar fauna appears in Lower Devonian of Bohemia, in Brittany
(limestone of Erbray) and in the Urals. The Upper Devonian of the Harz
passes up into the Culm.

In the eastern Thuringian Fichtelgebirge the upper division is
represented by _Clymenia_ limestone and _Cypridina_ slates with Adorf
limestone, diabase and Planschwitzer tuff in the lower part. The
middle division has diabases and tuffs at the top with Tentaculite and
Nereite shales and limestones below. The upper part of the Lower
Devonian, the sandy shale of Steinach, rests unconformably upon
Silurian rocks. In the Carnic Alps are coral reef limestones, the
equivalents of the Iberg limestone, which attain an enormous
thickness; these are underlain by coral limestones with fossils
similar to those of the Konjeprus limestone of Bohemia; below these
are shales and nodular limestones with goniatites. The Devonian rocks
of Poland are sandy in the lower, and more calcareous in the upper
parts. They are of interest because while the upper portions agree
closely with the Rhenish facies, from the top of the Coblentzien
upwards, in the sandy beds near the base Old Red Sandstone fishes
(_Coccosteus_, &c.) are found. In France Devonian rocks are found well
developed in Brit