Lastly,
in red sandstones of Permian age in Dumfriesshire have been
discovered the tracks of what would appear to have been _Chelonians_
(Tortoises and Turtles); but it would not be safe to accept this
conclusion as certain upon the evidence of footprints alone. The
_Chelichnus Duncani_, however, described by Sir William Jardine
in his magnificent work on the 'Ichnology of Annandale,' bears
a great resemblance to the track of a Turtle.
[Footnote 20: Though commonly spelt as above, it is probable
that the name of this Lizard was really intended to have been
_Proterosaurus_--from the Greek _proteros_, first; and _saura_,
lizard: and this spelling is followed by many writers.]
[Footnote 21: In an extremely able paper upon the subject (Quart.
Journ. Geol. Soc., vol. xxvi.), Mr Etheridge has shown that there
are good physical grounds for regarding the dolomitie conglomerate
of Bristol as of Triassic age, and as probably corresponding in
time with the Muschelkalk of the Continent.]
No remains of Birds or Quadrupeds have hitherto been detected
in deposits of Permian age.
LITERATURE.
The following works may be consulted by the student with regard
to the Permian formation and its fossils:--
(1) "On the Geological Relations and Internal Structure of the
Magnesian Limestone and the Lower Portions of the New Red
Sandstone Series, &c.
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