eS rs a ee YAS, tee PRES Nae ee” Coa ue enn SS peey eg OP Sn ee ees on eeresmreni fa ee Se 
Sere er oes feet oe ae : Rape is. *S : 
1913] SNOW—DELAWARE COAST 53 
part of New Jersey. I agree with Stone (loc. cit.), SHREVE 
(loc. cit.), HARPER,’ and WILtiAMson®? that the flora of south- 
eastern Delaware has affinities, southward and northward, with 
districts much farther inland, rather than with the coastal regions. 
C. THE CANAL DUNE 
This dune, mentioned in the previous paper as having been 
formed, about a mile inland, from material excavated in making 
a canal, is at this time practically fixed. This is due (1) to the fact 
that the finer sand has been blown away, leaving the coarser 
material, and (2) to the binding power of plants. No Ammophila 
is to be found, but many of the plants characteristic of the Hudsonia 
complex and of the heath are present. 
III. Problems connected with the region 
Second series of dunes.—This series was omitted from the fore- 
going discussion, because of its possible relation to the problem 
concerning the change in direction of the coast line. 
This ridge of dunes is best seen north of Rehoboth, extending 
to the northwest from the end of the board walk, thus making an 
angle with the coast. It was considered in the previous report 
(p. 286) to be a ridge of dunes blown from the coast in a south- 
westerly direction. The dunes lie on a hard, flat foundation of 
clay and sand impregnated with iron. This is continuous with the 
bluff along which Surf Avenue lies and with the clay-sand ledge 
south of the town, shown in fig. 6. <A portion of this ledge was 
figured in the previous paper (p. 285) and erroneously called sand- 
stone. At Dewey Beach there again appears a clay-sand ledge, 
crowned with dunes, which, taken in connection with the clay 
areas north of Silver Lake, may be a continuation of the same forma- 
tion. In the absence of any geological information on the subject, 
the fact that these various outcroppings appear to be at the same 
level, together with their probable connection, suggests the possi- 
bility that this low bluff was the original sea-cliff, running from 
8 HARPER, R. M., Car-window notes on the Mens of the Delaware peninsula 
and southern Virginia. Torreya 9: 217-226. 1900. 
9 WILLIAMSON, aes Notes on the flora of central and southern Delaware. 
Torreya 9: 160-166. 
