INDEX FOSSILS 1095 



marine vertebrates, when well preserved, are also good horizon 

 markers. The very detailed knowledge of vertebrate anatomy 

 required, however, to determine the genera and species makes verte- 

 brate remains available only to the trained specialist. Plants fur- 

 nish good and reliable index fossils for terrestrial or delta forma- 

 tions, although their distribution is much more subject to limita- 

 tions, owing to climatic influence. The same may be said to be 

 true of land vertebrates. The subject is further discussed under 

 correlation, in Chapter XXXII. 



BIBLIOGRAPHY XXX. 



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2. BASSLER, R. S. 1910. Adequacy of the Paleontologic Record. The 



Paleontologic Record, pp. 6-9, reprinted from Popular Science Monthly. 



3. BERNARD, FELIX. 1895. Elements de Paleontologic. 



4. BLUM, T- REINHARD. 1843. Die Pseudomorphosen der Mineralogie, 



and First Appendix (Erster Nachtrag) 1847. Stuttgart. 



5. BLUM, J. R. 1852. Pseudomorphosen, Second Appendix. 



6. BLUM, J. R. 1863. Pseudomorphosen, Third Appendix. 



7. BLUM, J, R. 1879. Pseudomorphosen, Fourth Appendix. 



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9. CALVIN, SAMUEL. 1910. Adequacy of the Paleontologic Record. The 



Paleontologic Record, pp. 2-6. Reprinted from Popular Science Monthly. 



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Sharks of the Cleveland Shale. American Geologist, Vol. XXX, pp. 

 273-278, pis. VIII and IX. 



11. D'ORBIGNY, ALCIDE. 1849. Cours Elementaire de Paleontologic at 



de Geologic Stratigraphiques. 3 vols. Victor Masson, Paris. 



12. FARRINGTON, OLIVER C. 1899. A Fossil Egg from South Dakota. 



Field Columbian Museum. Pubhcation 35, Vol. I, No. 5, Geol. Series 

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13. GRABAU, A. W. 1899. PalcEontology of Eighteen Mile Creek. Bulle- 



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15. HUGHES, T. McKENNY. 1889. On the Manner of Occurrence of 



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