78 FLORIDA GEOLOGICAL SURVEY-SEVENTH ANNUAL REPORT. 
the crown into an anterior and posterior pillar. On the inner sur¬ 
face of the tooth is seen two or three faint furrows, which, however, 
scarcely appear on the crown. The cross section of the molar is 
thus that of an ellipse slightly compressed at the center more strongly 
so from the outer side. 
The lower jaw is more or less pointed in front and contains 
nine teeth. Of the teeth the posterior six are molariform in appear¬ 
ance and function, while the anterior three are reduced and are more 
nearly circular in across section. In general appearance the jaw 
is distinctly glyptodont. From the glyptodonts, however, the genus 
is distinguished not only by the structure of the teeth which lack 
the tripartite division of the crown and base, but by the fact that the 
ramus of the jaw is inclined gently backward, and does not turn up 
at a right angle, or more than a right angle as in the glyptodonts. 
Moreover, the shield consists of an anterior and posterior buckler 
with several movable transverse bands between similar to those of 
the armadillos. Although referred to the Dasypoda, the genus is 
recognized as in many ways intermediate between the armadillos 
and the glyptodonts.* 
LOCAL DEPOSITS OF RIVER PEBBLE PHOSPHATE. 
The localities in the State where small deposits of river pebble 
phosphates have accumulated are rather too numerous to describe 
separately. A number of the important localities, however, may 
be referred to. For the location of the deposits see the map on 
page 30. 
PEACE CREEK. 
Peace Creek originating in the northern part of Polk County, 
flows south across both the Alum Bluff phosphatic marl and the 
land pebble phosphate deposits. The conditions for the accumula¬ 
tion of pebble phosphate in the valley of this stream, therefore, have 
been particularly favorable, and it is on this stream that the most 
extensive river pebble phosphates in Florida have been found. The 
Peace Creek beds have also a historic interest since it was here in 
1888 that phosphate mining in Florida began. 
Owing doubtless to the mixed condition of the fossils, some dif¬ 
ference of opinion has been expressed as to the age of the Peace 
*Sellards, E. H., Chlamytherium septentnonalis, an Edentate from the 
Pleistocene of Florida. Amer. Journ. Sci. Vol. xl, Aug., 1915. 
