DESCRIPTIVE GEOLOGY. 23 
whose extent and relations to the rocks of Devonian age arc not 
yet determined. 
The following fossils, determined by G. H. Girty, were collected 
at the two localities, and the discussion of them is quoted from his 
report : 
Fossils from near Yukon Flats <nul from Hess ('reck, Alaska. 
A AH 213. 
Stenopora 2 sp. Rliombopora sp. 
Fenestella sp. Productus? sp. 
Rliombopora sp. Lima? sp. 
4 AP 270. 
Fistulipora sp. Rbombopora sp. 
Stromatopora ? sp. Rbombopora sp. 
Coral sp. Spirifer n. sp.? 
Fistulipora sp. Hustedia cf. H. compressa Meek. 
Fistulipora ? sp. 
4 AP 277 
Coral? sp. • Polypora? sp. 
Litbostrotiou? sp. Archimedes? sp. 
Fistulipora 3 sp. Productus sp. 
Rhombopora sp. Euomphalus sp. 
The presence of tbe form identified as Hustedia compressa seems to show tbat 
lot 270 belongs in tbe Pennsylvanian, perhaps in tbe " Permo-Carboniferous." 
Tbe ages of the otber lots, although without much doubt being Carboniferous, 
are less certain. Wbile probably no species is common to all tbree collections, 
yet in a general way tbe facies is much tbe same, and it is quite possible tbat 
all represent the same fauna. 
It will be observed tbat only in one case have the forms collected been identi- 
fied specifically. In many instances tbe material is too imperfectly preserved 
to admit of more than tbe genus being determined. In others the species are 
distinct from those of tbe Mississippi Valley sections, and entirely new unless 
some of them bave been described in European and Asiatic publications not 
included in my bibliography and therefore difficult of reference. 
I. bave consulted freely with Mr. Bassler wherever the Bryozoa were con- 
cerned. 
MESOZOIC ROCKS. 
CRETA< Kins. 
On the flanks of Wolverine and Lynx mountains there are black, 
rather massive, carbonaceous sandy shales. In those of Wolverine 
Mountain, which form great rock piles along the upper parts of the 
spurs at an altitude of over 1.000 feet above the base of the mountain. 
there were found in 1905 fragments of dicotyledonous Leaves and a 
part of an indeterminable bivalve, and on this basis the rocks were 
assigned to the Cretaceous. The Lynx Mountain rock- are correlated 
on only Lithologic grounds. 
