60 Berry: MESOZOIC FLORA OF ATLANTIC COASTAL PLAIN 
Dillenites, Cinnamomum, Nectandra, Myrcia, Eugenia (?), Corno- 
phyllum, Chrysophyllum and Acerates, which have not been found 
at the Perry Place. Farther than this among the larger genera, 
Myrica with eleven species has only one common to the two 
localities, only two of the Leguminosae are common to both locali- 
ties, of the seven species of Celastrophyllum there is but one species 
found at both outcrops, of the nine figs none are common to both, 
of the five species of Apocynophyllum none are common, of the 
three species of Zizyphus only one is common and that one is 
rare at one locality and abundant at the other; similarly of the 
three species of Ternstroemites only one is found at both localities. 
Since these two horizons have been shown by the mapping to 
practically coincide these marked differences in apparent facies 
can be due to but two causes. That is they are to be accounted for 
solely as the result of accidents of preservation or discovery 
or as due to local differences in environmental conditions at the 
time of growth. Possibly a combination of these two is the 
correct solution. I am inclined, however, to think that in this 
as in many other cases of fossil floras and faunas, accidents of 
preservation and discovery are the major factors, and this em- 
phasizes anew the extreme danger of relying upon negative 
evidence, since did we not know otherwise we should doubt the 
contemporaneity of these two florules. 
All of the remaining localities where Ripley plants have been 
discovered have yielded too few species to afford satisfactory .evi- 
dence for close correlation. Those in Tennessee are known to 
be of approximately identical age as the Perry Place and Cooper 
Pit from their stratigraphic position. Those in Barbour County, 
Alabama are undoubtedly Ripley but whether younger or older 
than the Tennessee floras cannot be determined. The two plant- 
bearing localities in Georgia wh'ch L. W. Stephenson has referred 
to the Cusseta sand member or lower Ripley of the Georgia area 
are of especial interest since they are the same age as the Coffee 
sand of Tennessee. 
The localities of Henry and Carroll Counties, Tennessee, 
are well toward the head of the Cretaceous Mississippi,embayment 
and over three degrees north of the localities in Barbour County, 
Alabama or of the Ripley localities in Georgia. Moreover it is 
