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SMITHSONIAN INSTITUTION 



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Fie;. 9. — Outcrop of Paleozoic glacial tillite at Squantum Head, Boston Bay. 



(Photograph by W. S. Cole.) 



Fig. 10. — Quarry at Vincentown, New Jersey, showing the well developed 

 unconformity (indicated by ink line) between Vincentown bryozoan marl, 

 below, and Tertiary sands, above. (Photograph by Bassler.) 



