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as you evidently suspected in 1915. Of the Hami3tton Gra.p- 
+rtl ,x o -» . . _ from Indiana 
tolxtes listed by Shrock (1938), all but three apparently 
are from below the chert at Hamilton. I judge that where 
Spencer says "Niagara dolomite" he means the beds below the 
chert beds. The Decew is certainly Rochester. After exami- 
ing Ruedemann 1 s"sljale channel "at Gasport (now almost quarried 
out) I believe that some of it is older than the Gasport.But 
in the present conditions there it is very hard to say. It wee 
evidently much btter shown when Ruedemann collected from it. 
The Mississinewa is undoubtedly Rochester, as we 
,• • "-V- v-- & ; v" v v 0 
*. v • ■ • • • ; V- 
have correlated it. The coral beds (Liston Creek, Waukesha. 
Coral Beds of Wisconsin, Manistique as restricted, Louisville) 
are very early Lockport. .I now have many more typical Louis- 
ville species in the Liston Creek; and the correlation of 
the L. 0* with the Louisville is beyond question. The * Loui- 
ville is not only not above the Guelph ; it is below the Racine , 
The Liston Creek is 80 feet thick in the wells at Ft. Wayne. 
It may comprise Laurel, Waldron and Louisville time. The lower 
part contains Pisocrinug , which also occurs in the reefs of 
the Mississinewa, The shaly bed about the middle contains 
many Waldron species. The corals are in the upper half** and 
in the reefs. 
With kindest regards, very sincerely yours. 
y 
/ 
