TRbooora 
JOURNAL OF 
THE NEW ENGLAND BOTANICAL CLUB 
Vol. 11. December, 1909. No. 132. 
ТНЕ SUBMARINE CHAMAECYPARIS BOG AT WOODS 
HOLE, MASSACHUSETTS.! 
HARLEY Harris BARTLETT. 
(Plate 82.) 
THE bog which is described in this paper is of unusual interest 
from two stand-points,— to the botanist because it illustrates the 
genesis of a typical salt-marsh from a fresh water bog, to the geologist 
because it affords evidence of post-glacial subsidence in the Cape Cod 
district. It is probable that the origin of salt-marshes through in- 
vasion of fresh water bogs by the sea has not been infrequent on the 
New England coast, but with the exception of a recent paper by Pen- 
hallow, very little has been written on the subject. ‘The question of 
post-glacial subsidence, on the other hand, has been much discussed. 
It hardly comes within the scope of this paper more than to state that 
geologists have shown that such a subsidence has taken place from 
Nova Scotia to New Jersey, and that it is still in progress. Along 
certain parts of the coast, however, evidence of subsidence has either 
never been carefully studied, or has been considered inadquate. For 
example, Penhallow ? quotes Mr. Fuller of the United States Geolog- 
ical Survey as follows: — “Of the instances [of submerged stumps 
and peat masses] mentioned by Shaler and others in Massachusetts, 
those at Nantucket and Truro are perhaps the most prominent. ‘The 
submerged stumps at Truro have, in part at least, reached their present 
position by undermining. Ihave not examined the Nantucket locality. 
There appears, however, on the whole, to be very little evidence of a 
post-glacial subsidence in this region, although Dr. T. A. Jaggar a few 
1 Published by permission of the Director of the U. S. Geological Survey. 
2 Trans. Roy. Soc. Can. 3d. Ser. vol. i, section iv (1907), p. 22. 
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