1880 .] 
115 
[Crosby. 
occasionally indurated clay slates. On Flint Island, the strata dip 
about twenty-five degrees southerly (away from the mainland). 
On Ship Island, the dip is only eight degrees. There is no doubt 
but that these strata rest directly upon the syenitic rocks of the 
islands and main land adjacent An immense number of 
trap and porphyritic dikes traverse the strata of Flint Island. 
.... Occasionally a layer exhibits pebbles and sandstones.” In 
another place, Professor Hitchcock assigns these sediments in 
FTarraguagas Bay, provisionally, to the same horizon as the beds 
at Bar Harbor ; and suggests that they are probably connected 
with those under the water. 
These are conclusions in which my own observations have led 
me to concur. That the slates of Narraguagus and Frenchman’s 
Bays are the newest rocks on this part of the coast is conclusively 
shown — 
1. By their relations in dip and distribution to the present 
contours of the land, never lying far inland and always drpjfing 
away from the nearest shore. 
2. By their uncrystalline character. The slate, as already 
described, is often indurated near the intrusives ; but, besides the 
mica, which is rarely, if ever, indigenous, the only thing like crys- 
tallization which I have observed in the formation are some 
minute veinlets — two to twelve inches long — occurring in the 
slate at Bar Harbor, and filled with crystalline quartz, orthoclase 
and mica, true endogenous granite on a very small scale. 
3. By their relations to the intrusives, — the dikes being more 
regular and finer grained than in the surrounding crystalline 
formations. 
4. By the fossils which they contain, since this is the only fos- 
siliferous formation in the region. The rocks in Frenchman’s Bay 
have not before been known to contain organic remains ; but after 
a diligent search I have discovered some well preserved impres- 
sions which clearly belong under that head. These occur in the 
slate on the south-west side of Hawthorne (formerly Hog) Island 
near the village of West Gouldsborough. They are smoothly and 
even gracefully curved semi-cylindrical grooves and ridges about 
a line in diameter, and often a foot or two in length, which might 
