KNOWI.TON.] 



GEOLOGICAL CONSIDERATIONS. 



107 



The total number of forms represented is SO, of which number 11 

 have not been specifically named, and 30 species and 1 variety are 

 described as new to science. The remainder, or 37 species, are those 

 previouslj^ known from these beds. Of these 37 species, 12 (those 

 marked with an asterisk in the preceding- list) ha\'e not been found 

 beyond the limits of these beds, leaving- 25 species which have an out- 

 side distribution. This distribution is shown in the following table: 



Table slioiving extralimltal (listrihntiori. of f ami pi av Ik from Van Honi >< yanch and 



vicinity. 



In my report on the collection of plants from Van Horn's ranch'* 

 and vicinity obtained by Dr. Merriam I made the following statement: 

 " The flora of the Van Horn ranch finds its greatest affinity with that 

 of the Auriferous gravels and with allied floras of California, and is 

 to be regarded as upper Miocene in age." Since writing this I have 

 brought out the fact, already set forth, that certain of the species 

 most relied upon in making this correlation, such as Quercus pseudo- 



aUniv. Cal., Bull. Dept. GeoL, Vol. II, No. 9, p. 309. 



