64 Scientific Intelligence. 
Brick-clays making cream-colored bricks in Minnesota.— 
Profesor N. H. WINCHELL, in abe oes Publications, No. 8 
Carver, Chaska and aoe ae preg on oe cream-colored 
combination with the silica and alumina a of remaining a 
oxide, a point first explained by Mr. E. T. Sw These apres 
clays are those of the earlier drift, and are cae by Professor 
Winchell to have been derived from the clay-beds of the Cretace- 
ous. The clay-beds in the State connected with the later alluvium 
make red bric 
8. Geology of Frenchman's Bay, Maine, just east of Mount 
Desert Island.—This locality is the subject of a pape rb O. 
Crospy in the Proceedings of the Boston Society of Maison! His- 
tory, 1880, p. 109. The schistose rocks of the region about 
ite, siliceous argillite, sometimes hornblendic; and the group 1s 
metalliferous, it conta wee the silver bearing vein at Sullivan 
Falls. These rocks are stated to oc on the north side o 
wick. On the islands of the bay are other rocks, referred to a 
later age, which are entirely uncrystalline, the chief kind being a 
slate of black, drab and purplish shades of color, passing into 
siliceous slate and sandstone and a micaceous slate. They con- 
tain no fossils in Frenchman’s Bay, but the same slate on the 
a 
similar slate has afforded at Narraguagus, according to Professor 
. 8. Hitchcock, an Orthis and Crinoidal joints, and at Foster’s 
Island off Machiasport, undetermined Rhynchonelle. Mr. Crosby 
agrees with Professor Hitchcock in referring the slate rocks of 
Frenchman’s Bay, areas to the Cambrian or Primordial. The 
rocks of the egen are intersected by dikes of diorite or allied 
rocks and gr 
9, Coking pene and anthracite of Colorado.—Professor J. 8. 
Newserry, in the Transactions of the New York Academy of 
Sciences, for 1881- 1882, p. 8, observes that a coking coal occurs 
H 
amber “es noooediti ve a recent analysis m 
eoren! of Min ew York, ane as less than one per ce 
sulphur, and only three of ash and i is not inferior to Pennsylvania 
anthracite. 
Pea ne ee 
