Page:Walcott Cambrian Geology and Paleontology II.djvu/35

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NO. 1
ABRUPT APPE.RANCE OF THE CAMBRIAN FAUNA
15

6. The apparently abrupt appearance of the Lower Cambrian fauna is therefore to be explained by the absence on our present land areas of the sediments, and hence the faunas of the Lipalian period. This resulted from the continental area being above sea level during the development of the unknown ancestry of the Cambrian fauna.

I fully realize that the conclusions above outlined are based primarily on the absence of a marine fauna in Algonkian rocks, but until such is discovered I know of no more probable explanation of the abrupt appearance of the Cambrian fauna than that I have presented.


BIBLIOGRAPHY

Barrell, Joseph.
1906. Journal of Geology, Vol. 14, pp. 316-356, 430-457, 524-568: Relative Geological Importance of Continental, Littoral and Marine Sedimentation.
1908. Journal of Geology, Vol. 16, 1908, pp. 159-190, 255-295, and 363-384: Relations Between Climate and Terrestrial Deposits.
Brooks, W. K.
1894. Journal of Geology, Vol. 2, 1894, pp. 455-479: The Origin of the Oldest Fossils and the Discovery of the Bottom of the Ocean.
Chamberlin, T. C., and Salisbury, R. D.
1906. Text Book of Geology, Vol. 2, 1906.
Darton, N. H.
1905. U. S. Geol. Survey, Professional Paper No. 32, 1905, pp. 1-409: Preliminary Report on the Geology and Underground Water Resources of the Central Great Plains.
Keith, Arthur.
1903. U. S. Geol. Survey Geologic Atlas, Cranberry Folio, No. 90, Text, pp. 1-9, plates 5.
1907. U. S. Geol. Survey Geologic Atlas, Roan Mountain Folio, No. 151, Text, pp. 1-11, plates 7.
King, Clarence.
1878. Report of the Geological Exploration of the Fortieth Parallel, Vol. 1, 1878: Systematic Geology.
Knowlton, F. H.
1902. Bulletin of the United States Geological Survey, No. 204, 1902: Fossil Flora of the John Day Basin, Oregon.
Merriam, J. C.
1901a. Journal of Geology, Vol. 9, 1901, pp. 71-72: A Geological Section through the John Day Basin.
1901b. Bulletin of the Department of Geology of the University of California, Vol. 2, 1901, pp. 269-314: A Contribution to the Geology of the John Day Basin.
Richthofen, F. von.
1882. China, Vol. 2, 1882.