Image from the Biodiversity Heritage Library.
Contributed by Yale Peabody Museum of Natural History.
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Transcription
The evidence as seen at West Chester
and Leetown is certainly not at all in favor
of a time break between the Ost Antum me
Aurheim formation. It is however clear that
the great bulk of the Ost Autumn fauna gra-
dually die out and that but little of it is
left at the close of this time. The sea was
taken possession of locally by vast beds of
P. fouldensi and P. lyrata with a scattering
of other species in occasional specimens.
This faunal change goes on to the end
of the Ost Autumn and with the introduction
of Aurheim a great migratory wave occurs.
At West Chester this is easily seen in the
abundance of bryozoa of many new species,
but at Leetown where Phole dominates
one does not notice the change at all. I
could not be certain that Sloss in the Au-
reim until I got back above its base when
I got Orthos retusus and Septaria
chambriensis.