. The testimony of the rocks; . itz-bergen; and the abundance in which they were developedon the submerged plains and hill-sides of what are now Eng-land and Scotland, during what is termed the Pleistoceneperiod, shows of itself what a very protracted period thatAvas. The prevailing tellina of the bed which I last ex-plored,— a bed which occurs in some places six milesinland, in others elevated on the top of dizzy crags, — isa sub-arctic shell {Tellina proximo)^ of which only deadvalves are now to be detected on our coasts, but whichmay be found Hving at the North Cape and in pre
. The testimony of the rocks; . itz-bergen; and the abundance in which they were developedon the submerged plains and hill-sides of what are now Eng-land and Scotland, during what is termed the Pleistoceneperiod, shows of itself what a very protracted period thatAvas. The prevailing tellina of the bed which I last ex-plored,— a bed which occurs in some places six milesinland, in others elevated on the top of dizzy crags, — isa sub-arctic shell {Tellina proximo)^ of which only deadvalves are now to be detected on our coasts, but whichmay be found Hving at the North Cape and in prevailing astarte, its contemporary, was Astartearctica^ now so rare as a British species, that many of ourmost sedulous collectors have never seen a native specimen,but which is comparatively common on the northern shores 152 THE TWO RECORDS, of Iceland, and on the eastern coasts of Norway, withinthe arctic circle. In this elevated Scottish bed of thePleistocene period I laid these boreal shells open to the Fig. 87. Fig.
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