69 
Fossil Plants, Illustrating Method Employed by the U. S. 
Geological Survey, Dr. Arthur Hollick; Preliminary Correlation 
of the Cretaceous and Tertiary Fossil Floras of Alaska, Dr. Arthur 
Hollick. 
Dr. John K. Small gave a short description of recent botanical 
aoa es in aes Florida, referring especially to the Florida 
Ki on the position and extent of the Florida Keys 
and — oo. division into a Upper Sand Keys, Upper Keys, 
Lower Keys and Lower Sand Keys. These form a curved chain 
of islands which may ne described as follows: 
At the northeastern end of the chain are two sand islands, 
namely Virginia Key and Key Biscayne. These two bodies of 
sand are really mere detached portions of the slender coastal 
peninsula of sand-dunes extending along the eastern side of 
canary Florida. Seven miles south of i Biscayne a second 
of islands appears. These are composed of coral rock, 
a Ha from Soldier Key, for a distance of about one hundred 
and twenty miles, to the West Summerland or Spanish Harbor 
Keys. The islands are for the most part greatly elongated and 
adjacent mainland. The third natural group of islands begins 
with No Name Key and Little Pine Key and extends in a westerly 
direction for a distance of about thirty miles, to Key West. 
The islands of this group are composed of Miami Limestone, and 
although irregular in shape, the long axis is nearly north and 
south, thus also differing from those of the previous group. The 
fourth group of islands lies to the westward of Key West and 
reaches well into the Gulf of Mexico. They are composed of 
si e Upper Sand Keys maintain, for the most part, a 
sand-dune and hammock flora which is related to that of the 
coastal peninsula north of them. The Upper Keys are naturally 
clothed with a dense hammock growth of tropical hardwood 
shrubs and trees, and palms; they closely resemble many of the 
Bahama islands. The Lower Keys are more varied in their 
vegetation, supporting large areas of pineland and palmland, 
as well as extensive hammocks. ir vegetation nee close 
relationship to Cuba, and the ona are almost identical 
