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Ch. 1: Introduction

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2                 GEOLOGY OF NEW YORK CITY
sedimentation which built up these areas was originally derived from the primary- rocks and from the debris of the calcareous parts of sea-animals. Much re-sedimentation from previously lithified (made-into-stone) sediments contributed towards the extension of the continent at interior points and along its oceanic margins, and with this were occasional injections of igneous rock. This earliest or archœan continent was thrown somewhat to the east, as can be seen in the reproduction from Dana's Geology (Fig. i), with the outlying southern 'exten­sions existing as linear strips or lenticular islands arranged on
the east in axial lines that run northeast and southwest, and on the west, northwest and southeast. But these elevations, in their structural relations, define themselves as parts of a lithic block of comparative shallow submergence which stood between the two oceans—which were abyssal creases on either
Ch. 1: Introduction Page of 281 Ch. 1: Introduction
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