200
PROCEEDINGS OF THE GEOLOGICAL SOCIETY. .DeC. 13,
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still loftier Hoher Sentis and the high tracts
of Appenzell ; a district which is rendered
classical in geology by the recent labours of
M. Arnold Escher de Linth. We have there
not only that series which has been already
so much dwelt upon, from a low horizon in
the Jura limestones through the neocomian
to the cretaceous series including the inoce-
ramus limestone, but also a very complete
exhibition of nummulite rock and flysch.
Seeing that M. Escher had so fully made
himself master of all the dislocations as well
as all the regular successions both of the
plateau of Wildhaus and of the Hoher Sentis,
I could only pretend to offer one, I trust not
unimportant addition to his valuable contri-
butions, by bringing to his notice a band
between the inoceramus and nummulite lime-
stones, which I consider to be of value in de-
monstrating a lithological transition from the
cretaceous system, properly so defined, to that
which overlies it. I also urged him to adopt
my method of classifying the nummulitic and
flysch rocks as lower tertiary, and no longer
to include them in the cretaceous series*.
In travelling from Mells near Sargans to
Wallenstadt and Wesen, a clear ascending
order of the strata is visible, from the
, *'Sernft" conglomerate (the most ancient
rock of the region) at Mells (fig. 14). This
by reference to his well-filled note-book, that this
would be found the grandest and clearest of all the
Swiss sections in explaining the true overlying rela-
tions of the flysch and nummulites to the cretaceous
rocks.

• In the tabular view of his memoir entitled *Ge-
  

birgskunde,' appended to the description of the can-
ton Glarus by Professor Heer, M. Escher gives the fol-
lowing names in ascending order of all the strata of the

• ' Kreide-bildungen": — 1. Spatangus kalk (Studer)
  

or Lower Neocomian. 2. Schratten kalk or Upper
Neocomian. 3. Turriliten-EtageorGault. 4. Sewer-
kalk or chalk. 5. Nummuliten Etage. 6. Flysch
and Dachschiefer von Plattenberg.
-f- Although this diagram, from the pencil of
M. Escher, exhibits a thin course of it only, the zone
of gault or upper greensand exists in full force around
the Sentis. In the valley of the Rhine, and extend-
ing to Eichberg, it appears in insulated hummocks
charged with Turrilites, Inoceramus sulcatus and
other fossils, which with many forms gathered from
the different overlying rocks around the Hoher Sentis,
Prof. Briinner and myself examined in the rich mu-