I 



t 



1902] NOTES ON THE PHYTOGENY OF LIRIODENDRON 63 



^ Matthew and Davis" have recently advanced reasons for con- 



sidering a considerable number of the so-called Tertiary lake 

 formations to be flood-plain and aeolian deposits. If their argu- 

 ments are sustained, which seems unlikely except for restricted 

 areas, the absence of leaves from these formations becomes 

 explicable. Be this as it may, the record has thus far proved 



^ barren, and we can only congratulate ourselves that the more 



ancient record is so complete. We can better spare the record 

 of the Tertiary, for the modern form became practically fixed 

 in Z. oblojigifoliiim of the Amboy clays, or its undiscovered, 

 closely related contemporary, and has changed but slightly 

 in subsequent times. 



^ A summary of these suggested relationships may be presented 



as on opposite page, 



Passaic, N. J, 



"Matthew, W.D, Bull Am. Mus. Nat. Hist. 12:25. 1899; Gilbert, G. K. 

 17th Ann. Rep. U. S. Geol. Surv. 1895-6, part 2, p. 575; Williston, Kan. Univ. 

 Geol. Surv. Rep. 1S96; see also Fraas in Science 14: 210. 



