JO FLORIDA GEOLOGICAL SURVEY TENTH ANNUAL REPORT. 
to permit this definite correlation, except as supported by fossils. 
When the terrace in question is followed to the north, it is observed 
to approach the present shoreline and to disappear somewhat north 
of St. Augustine by merging with the recent beach terrace. It is 
possible that the terrace may be again located farther to the north 
and its relation to the other terraces established. However, until 
this is done the correlation of the terraces on field observation in 
the writer’s opinion, can not be considered complete. 
The fact that recent species of land and fresh water mollusks 
are associated with the vertebrates can not be regarded, for reasons 
already given, as affording any conclusive evidence as to the age of 
the beds. The high percentage of existing species in the under- 
lying shell bed is suggestive as to the age of that deposit. How- 
ever, no one of the students of the marine mollusks has held, so far 
as the writer has observed, that the study of that group has pro- 
gressed far enough to permit the discrimination of horizons within 
the Pleistocene of the Coastal Plains. There remains the evidence 
derived from: the fossil plants. As already noted, from this horizon 
there has been obtained but a single species, an oak regarded as 
identical with a recent species. From the next overlying horizon, 
however, a much more representative flora has been secured. 
This flora is regarded by Berry as representing the late Pleistocene 
and as the equivalent of the Talbot of Maryland and New Jersey. 
Unfortunately the flora, except the one species referred to, is from 
above rather than in the horizon under discussion. The opinion 
has been expressed by Berry, and also by the present writer, that 
there seems to be no considerable break between the two horizons. 
However, the suggestion of a possible break interferes with apply- 
ing strictly the evidence derived from the fossil plants, except as to 
the one species, to the problem of the age of this stratum. The sum- 
mary of the evidence thus far available seems to indicate that while 
the horizon from which this skull has been taken can be shown to 
be Pleistocene and to be interpolated between other Pleistocene 
horizons, its exact place within the Pleistocene can not at the pres- 
ent time be regarded as fully determined. 
