130 
Geology of Sydney- 
A alley, thousands of impressions are preserved on slabs 
of sandstone, evidently formed by animals walking 
over the yet unsolidified sandstone. On some of the 
slabs, tracks are so abundant that all individual marks 
are obliterated, and the slabs look notunlike a a muddy 
road after a flock of sheep had passed.” Professor 
Hitchcock studied these tracks very minutely, and tells 
us that the discovery indicates more than one hundred 
species of animals. He reckoned they indicated thirty- 
one species of birds, seventeen species of lizards, eleven 
varieties of frogs, a number of bird-lizards, and some 
creatures resembling marsupials. 
One of the birds is described as covering a yard 
and a half at every stride. It was about twelve feet 
high, and was quite a quarter of a ton in weight. 
Certainly the most remarkable creature of Triassic 
times is the salamander-like or frog-like reptile named 
by Professor Owen LabyrinthodoUj from the labyrin- 
thine appearance of cross-sections of its teeth. This 
extraordinary creature was first known from its foot- 
prints, which resemble rude impressions of the human 
hand. A frog close on two feet long would in all 
conscience be uninviting enough, but here we have 
tracks left by a creature of this sort, and every imprint 
measures twenty-two inches in length. In weight and 
bulk they were certainly equal to an elephant. 
Even in England Labyrinthodont footsteps have 
been found abundantly near the village of Lynn, and 
also at the Stourton Quarries, Liverpool. In these 
