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Updated: June 17, 2025


Shallow-water deposits of the immense thickness found in mountain ranges can be laid only in a gradually sinking area. A profound subsidence, often to be reckoned in tens of thousands of feet, precedes the upfolding of a mountain range.

We can hardly account for this except by a shallow-water connection between the two ancient epicontinental seas. It was perhaps along the coastal shelves of a northern land connecting America and Europe by way of Greenland and Iceland that the migration took place, so that the same species came to live in Iowa and in Sweden.

They could row most ways from there I'm not exaggerating they had to stay at home time and time again last summer, when it was easy for Snjolfur and me to put off. There's a world of difference between a deep-water landing-place and a shallow-water one that's what Snjolfur said many a time. The factor asked his visitor what price he had thought of putting on it for the summer.

The known fauna of the Bala group comprises 565 species, 352 of which are peculiar, and 93, as before stated, are common to the overlying Llandovery rocks. The formation generally appears to be of shallow-water origin, and in that respect is contrasted with the group next to be described.

With few exceptions, the stratified rocks of the land are proved by their fossils and composition to have been laid in the sea; but in the same way they are proved to be offshore, shallow-water deposits, akin to those now making on continental shelves.

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