I 1 8 FLORIDA GEOLOGICAL SURVEY-EIGHTH ANNUAL REPORT. 
1910. Vaughan, T. Wayland: 
A Contribution to the Geologic History of the Floridian 
Plateau. Carnegie Institution of Washington, Publication No. 
T 33 - PP- 99 - i8 5 > i 9 ! 0 - 
1913. Scott, W. B.: 
A History of Land Mammals in the Western Hemisphere, 693 
pp. New York, 1913. The MacMillan Company. 
The Alachua clays of Florida are placed in the Lower Pliocene, while the 
Peace Creek beds are referred to as upper, Pliocene or lower Pleistocene (p. 127). 
1913. Matson, G. C. and Sanford, Samuel: 
Geology and Ground Waters of Florida. V. S. Geological 
Surv., Water Supply Paper 319, 445 pp., pis. 1-17, figs. 1-7, one 
map, 1913. Prepared in co-operation between the United States 
Geological Survey, under the direction of Thomas Wayland 
Vaughan. 
In this report the Bone Valley formation is regarded as probably Pliocene 
and somewhat older than the Caloosahatchee marl, and in part at least con¬ 
temporaneous with the Alachua clays. 
1913. Gidley, J. W.: 
(Notes on the relative ages of the beds at Archer, at Mixon’s 
and at Ocala. Fla., and their correlation with deposits of the west¬ 
ern-plains region.) Included in Geology and Ground Water of 
Florida, U. S. Geol. Survey, Water Supply Paper 319, pp. 142-143, 
I 9 I 3 - 
The beds at Archer and Mixon’s are regarded as upper Miocene or lower 
Pliocene, their fauna corresponding in point of development with that of the 
Republican River formation of Kansas and Nebraska. The fauna of the Peace 
Creek beds suggests Pleistocene or late Pliocene. 
1913. Hay, Oliver P.: 
Notes on some fossil horses, with descriptions of four new 
species. U. S. Nat. Mus. Proc., Vol. 44, pp. 569-594, pis. 69-73, 
I 9 I 3 - 
Two new species of fossil horses are described from Peace Creek, Florida, 
Equus leidyi and Equus littoralis. 
