88 CONTRIBUTIONS TO THE GEOLOGY OF MAINE. [bull. 165. 
in the Silurian system. The special Chapman fauna, the writer is 
at present inclined to think, is equivalent to the Lower Oriskany fauna, 
as recognized at Becrafts, and farther south in Virginia and Tennessee; 
but however the precise correlation with the faunas of interior America 
may be settled, the place of the Chapman fauna above the general 
Lower Helderberg fauna is well established by the Gaspe and Arisaig 
sections. 
New Haven, Conn., December, 1899. 
MAPLETON SANDSTONE. 
This sandstone contains plant remains which have been submitted 
to Mr. David White, of the United States Geological Survey, for 
special study. JPsilophyton princejjs is among the species seen, and 
the age of the sandstone is clearly Devonian. Psilophyton was also 
seen in the Chapman sandstones, with a marine fauna. These Mapleton 
sandstones are believed to be of more recent age than the Chapman 
rocks, but were probably continuous with them, and the two may rep- 
resent the base and succeeding strata of the Gaspe sandstone of Gaspe 
Peninsula. 
Dr. Gregory has given an account, in his part of this report, of the 
petrographic, structural, and areal features of this sandstone (p. 136). 
MOOSE RIVER SANDSTONE. 
In Somerset County, northwestern Maine, there is a belt of sand- 
stones and arenaceous shales, in some zones of which there is a fairly 
abundant fauna. 
It is generally a tough, grayish sandstone with some argillaceous 
layers, weathering brownish from iron oxides, and of considerable 
thickness, running up into the hundreds and probably reaching several 
thousands of feet in thickness. 
It was called " Oriskany sandstone," by C. H. Hitchcock, in the 
Report on the Agriculture and Geology of Maine, 1 and was described 
in the following terms: " Its most southwest locality is at Parlin Pond, 
then it is seen on Moosehead Lake, Chesuncook Lake, Telos and Web- 
ster lakes, and the Aroostook River." 2 It is mapped as a belt, about 
the width of a township, extending from the fourth township west of 
Moosehead Lake, on the seventh range (Bradstreet), thence running 
obliquely northeastward in a somewhat curving line toward Ashland, 
in Aroostook County. Billings, in the proceedings of the Portland 
Society, 3 defined the fauna at two points near Telos Lake. 
In 1889 a series of collections from the region west of Moosehead 
Lake was made by Gilbert Van Ingen for the purpose of ascertaining 
1 Agric. and Geol. of Maine, 2d series, 1861, p. 379; Geology of wild lands, map opposite p. 377. 
2 Op. cit., p. 379. 
3 Proe. Portland Soc. Nat. Hist., Vol. I, 1869, Pt. II, p. 106. 
