. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 130 THREE CRUISES OF THE ''BLAKE. paleozoic, mesozoic, and subsequent formations were depos- ' ""aU the evidence we have seems to show that up to the time of the cretaceous, the sedimentary rocks, in spite of then- enor- mous thickness, were deposited in comparatively shallow seas. We find in them abundance of animal remains, fossils, and even tracks, as well as ripple-marks, indicating the proximity of land. Yig. 62. — Archsean Map of North America. (Dana.) or of continental islands. Undoubtedly, i
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 130 THREE CRUISES OF THE ''BLAKE. paleozoic, mesozoic, and subsequent formations were depos- ' ""aU the evidence we have seems to show that up to the time of the cretaceous, the sedimentary rocks, in spite of then- enor- mous thickness, were deposited in comparatively shallow seas. We find in them abundance of animal remains, fossils, and even tracks, as well as ripple-marks, indicating the proximity of land. Yig. 62. — Archsean Map of North America. (Dana.) or of continental islands. Undoubtedly, in earlier geological periods there have been invasions upon as well as withdrav^^ls of the sea from the low continental masses resting upon the continental folds, and these invasions have left probably large shallow inland seas upon these folds. Then, as now there must have been a considerable deposit of finer material upon the outer edge of the continental masses then forming, which. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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