UNIVERSITY OF CALIFORNIA PUBLICATIONS 

 Bulletin of the Department of Geology 



Vol. 3, No. 19, pp. 403.410, Pis. 48-49. ANDREW C. LAWSON, Editor 



A FOSSIL EGG FROM ARIZONA. 



BY 



Wm. Conger Morgan 



AND 



Marion Clover Tallmon. 

 Contents. 



PAGE 



Introduction 403 



Occurrence 404 



The Enclosing Capsule 404 



The Egg Shell 405 



The Contents 406 



Measurements 409 



INTRODUCTION. 



Very few instances of the occurrence of eggs in the fossil 

 state have been recorded. The fossil eggs of New Zealand birds 

 are shells which have been preserved by reason of their thickness 

 and strength. The Chelonian eggs of Tertiary age from 

 Auvergne, France, are simply shells filled with hardened mud. 

 An interesting fossil egg from the American Miocene has been 

 described by Oliver C. Farrington* and has been considered the 

 egg of a duck. 



The specimen described in this paper was brought to the 

 attention of Professor John C. Merriam some months ago by Mr. 

 G. A. Helmore of San Francisco. It had been in Mr. Helmore's 

 possession for some years and was obtained by him from a pros- 

 pector who had found it in a large pebble embedded in placer 



* Field Columbian Museum, Pub. 35. Vol. I, No. 5, Geol. Series. A Fossil Egg 

 from South Dakota. 



