174 The American Geologist. March, isoo 
makes a last effort to strike out my Jurassic discovery in 
New Mexico, in order to maintain his saying of 1859 : 1, that 
he failed to recognize the Jurassic formation in any of the 
localities where it has been said to occur by Mr. Marcou; 
2, that he found northeast of Galisteo, dicotyledonous leaves 
in the Jurassic sandstone of Marcou ; 3, that he found also 
in several places of northern and central New Mexico the 
Gryphcea pitcher i of the Texas Neocomian, in places where 
Marcou referred erroneously the strata to his "supposed 
Jurassic ; and 4, finally that he has "shown Marcou's so-called 
Jurassic to be Cretaceous." Dr. Newberry claims that a "set 
of beds overlying the Trias and underlying the Dakota sand- 
stones occur in Utah, Colorado and Wyoming, and are proved 
by their fossils to be Jurassic. "But these beds wedge out 
toward the south, and I have been unable to find any traces of 
them south of Enchanted Springs, near the lower line of Col- 
orado." {Loc. cit. p. 15.) 
After my exploration of 1853, and the explorations in 1888 
and 1889 of the Tucumcari area by professors Robert T. Hill 
and Alpheus Hyatt, confirming in every respect ray discovery 
of the Jurassic system by proved fossils, more especially the 
Gryphma dilatata var. TiLcumcarii ; and the Geological map 
of Northioestern New Mexico by captain Clarence E. Dutton 
(U. S. Geol. Surv., Sixth Annual Report for 1884-85, Washing- 
ton), the reaffirmation by Dr. Newberry, that he did find no 
traces of the Jurassic in New Mexico, does not require any 
commentary ; to quote it is sufficient. 
Camlridge^ Mass.., December, 1889. 
NOTE ON THE OCCURRENCE OF NATIVE COPPER IN THE 
ANIMIKIE ROCKS OF THUNDER BAY. 
By Andrew C. Lawsom, Ottawa, Ont. 
Among the rock formations of lake Superior, the Keweena- 
wan or Nipigon series has long been recognized as strongly 
characterized and differentiated from older and newer rocks, 
by the occurrence of deposits of native copper. So distinctive 
have these features appeared that a common synonym for the 
Reries is "The copper-bearing rocks." No occurrence of native 
copper in the Animikie rocks has, so far as the author is aware, 
been recorded. Any facts therefore, which indicate that native 
