. The geology of Nova Scotia, New Brunswick, and Prince Edward Island, or, Acadian geology [microform]. Geology; Geology, Stratigraphic; Paleontology; Geology, Economic; Géologie; Géologie stratigraphique; Paléontologie; Géologie économique. 123 THE TRIAS OR NEW RED activity. Without thoBO nothing very certain can bo determined on those Bubjccts. The apparent thinness and density of the bone, however, and its widtii of surface, convey the impression tlmt it was intended to combine great strength with great lightness, and therefore that it belonged to a creature of terrestrial habit
. The geology of Nova Scotia, New Brunswick, and Prince Edward Island, or, Acadian geology [microform]. Geology; Geology, Stratigraphic; Paleontology; Geology, Economic; Géologie; Géologie stratigraphique; Paléontologie; Géologie économique. 123 THE TRIAS OR NEW RED activity. Without thoBO nothing very certain can bo determined on those Bubjccts. The apparent thinness and density of the bone, however, and its widtii of surface, convey the impression tlmt it was intended to combine great strength with great lightness, and therefore that it belonged to a creature of terrestrial habits. Probably con- siderations of this kind, though he does not state his reasons, induced Dr Leidy to hazard the conjecture, " Was this animal probably not one of the bipeds which made the so-called bird-tracks of the New Red Sandstone of the valley of the Connecticut? " This conjecture of an eminent anatomist, itself shows how singular and anomalous among reptiles is this fossil fragment. Had this fossil been specifically Identical with any reptile whose remains have been found in other countries the age of whose rocks has been determined, it might iiave given conclusive evidence as to the true geological age of the red sandstones of New London. It is, however, a new species of a new genus, quite distinct therefore from any species found elsewhere. Still it gives some important testimony. It belongs to a group of large and highly organized carnivorous reptiles now extinct, and which occupied in the Secondary period of geology a place afterwards taken by the carnivorous mammalia. No reptiles of equal grandeur and perfection have existed since the beginning of the Tertiary period; and so '"ar as we know, none were created before the very close of the Pala;ozoic period. Between these eras, therefore, Ave may i)lace our fossil; but this gives a very wide range. There is, however, a difference oifades or general appearance between t' - reptiles of different parts
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