Sie University of Kansas Geological Survey. 
with the first ice invasion and continuing until the present, or 
that which is commonly called the ‘Quaternary.’ This was called 
the Pleistocene.” 
“The second period shall include the time divisions sometimes 
called Pliocene and Miocene. Its earlier limitations shall be that 
indicated by paleontology, and its latter the first ice invasion of 
the Pleistocene; and its designation shall be the Neocene.” 
“Nhe third period shall be the Eocene. * * * Its definition 
shall be that commonly accepted by paleontologists and geologists 
as determined by fossil remains.” 
“The fourth period shall be the Cretaceous. Its definition shall 
be that indicated by paleontology and usually accepted.” 
“he fifth period shall include the time divisions known as 
Jurassic and Triassic, and shall be designated as Jura-Trias. Its 
definition shall be by paleontology.” 
“The sixth period shall be Carboniferous, including the subdivi- 
sion sometimes called Permian. Its definition shall be by paleon- 
tology.’ 
“The seventh period shall be the Devonian. Its definition shall 
be that indicated by paleontology and usually accepted.” 
“Mhe eighth period shall include the time divisions sometimes 
styled Upper Silurian and Lower Silurian, and otherwise styled 
Silurian and Ordovician. Its definition shall be by paleontology, and 
its designation shall be Silurian.” 
“The ninth period shall be designated the Cambrian. The defi- 
nitions of its upper limit shall be by paleontology. * * * Its 
lower delimitation shall be the time of deposition of the lowest 
rocks thus far known to yield a well defined fauna.” 
“The tenth period shall be the time of deposition of plastic rocks 
older than the Cambrian. * * * The term Algonquin was men- 
tioned and agreed to as the designation of the period.” 
“The eleventh: The oldest time division shall cover the time of 
formation of the ancient crystalline rocks, and its designation shall 
be Archaean.” 
From what has already been said the reader will understand 
that it is impossible at any one place to find all the geologic hor- 
izons. There are different points in America from which one may 
