CARCINOMA OF THE THYROID IN SALMONOID FISHES. 417 



Boothbay Harbor. — Schists and gneisses with dikes of granite. Age unknown. 



Craig Brook (East Orland). — Granite. Silurian or Devonian age. 



Grand Lake. — Mica schist. Age unknown. Cut by granite of Silurian or Devonian age. 



Green Lake. — Granite. Silurian or Devonian age. 



Lake Auburn. — Mica schists. Age unknown. Cut by granite of probable Ordovician age. 



Lake Sebago. — Granite and granite gneiss. Probably Silurian or Devonian age. 



Portland. — Largely quartzose schist. Age unknown. 



York. — Volcanic tufif and lava flows cut by some granite. Age unknown. 



MARYLAND. 



Havre de Grace. — Potomac formation. Carboniferous age. 

 Bryan's Point. — Talbot formation. Quaternary system. 



MASSACHUSETTS. 



Woods Hole. — Pleistocene glacial gravels. 



Gloucester. — Probably Rockport granite. Carboniferous age. 



East Freetown. — Granite. Probably Paleozoic age. 



Hartsville. — Stockbridge limestone next to Cheshire quartzite. Cambrian age. 



Plymouth. — Pleistocene glacial gravels and sands. 



MICHIGAN. 



Northville. — Cold Water shale. Carboniferous ^e. 



Alpena. — Antrim shale. Devonian age. Has a little gas. 



Charlevoix. — Antrim shale. Devonian age. 



Detroit. — Antrim shale and Traverse limestone. Devonian age. 



Sault Ste Marie. — Lake Superior sandstone. Cambrian age. 



MINNESOTA. 



Lester Park, Duluth. — Lavas of Keeweenawan series. Algonquin age. 



Homer. — Immediately underlain by St. Croix sandstone, bluffs to south are St. Peter sandstone, 

 Shakopee limestone, Jordan sandstone, and St. Lawrence limestone. Copious spring waters come from 

 these sandstone formations. The St. Lawrence is of Cambrian age; the otherof Ordovician age. 



MISSISSIPPI. 



Tupelo. — Pleistocene sands resting upon sandy portion of Selma chalk. Cretaceous age. 



MISSOURI. 



Neosho. — Boone limestone. Carboniferous age. 



MONTANA. 



Bozeman. — Neocene lake beds. Tertiary age. 



NEW HAMPSHIRE. 



Nashua. — Sand beds of glacial lake. Quatemar\- age. 



Lake Sunapee. — (East side) Granite; age unknown. Heavy cover of glacial gravel; quaternary- 

 age. (West side.) Formations unknown. 



