88 WARREN DUPRE SMITH AND EARL L. PACKARD 



Beginning on the west the first belt includes lenses on Cheney Creek, others 

 near Kerby, and some near Waldo. In this belt fossils collected by the writer 

 have been considered to be probably Carboniferous in age by paleontologists 

 of the U.S. Geological Survey. 



The second belt includes outcrops southwest of Gold Hill, also some west 

 of Provolt, those at Oregon Caves, and one on Sucker Creek. So far as known 

 no- fossils have been found in this group of outcrops. 



The third belt comprises the lime quarries on Kane Creek, the outcrops 

 near Applegate, and those west of Steamboat. Fossils obtained on Kane and 

 Steamboat creeks consist merely of fragments of round crinoid stems. 



The fourth belt of lenses is found in several outcrops on Little Applegate 

 River (and across the divide on Anderson and Coleman creeks) and in one (or 

 more) exposures near Watkins on Applegate River. In the former well- 

 preserved round and pentagonal crinoid stems have been found. The fossils 

 do not definitely determine the age of the third and fourth belts, and it seems 

 possible that they should be referred to the Silurian, or an earlier period. 



These limestone lenses are of considerable importance because limestone 

 is so scarce in Oregon that the supply for cement and other uses must be sought 



in them or in similar outcrops The origin of the limestone lenses is 



an unsolved problem of much interest and importance. 



MESOZOIC 



Triassic. —The Triassic is represented by sedimentaries and 

 associated lavas reported by Lindgren' from the southern flank; 

 and by Condon' from the northern flank of the Wallowa Mountains 

 in northeastern Oregon. These beds are typically exposed along 

 Hurricane Creek, Eagle Creek, and Powder River. The sedi- 

 mentary members on Eagle Creek consist of calcareous shales, 

 limestones, and agglomerates, aggregating several thousand feet. 

 Nearer the batholitic core of the range they are altered to slates, 

 schists and marbles. Farther west volcanic rocks, including 

 basalts, andesites, and tuffs, comprise the dominant part of the 

 series, while farther in the Wallowa Mouiitains masses of green- 

 stone occur which may belong to this series. 



J. P. Smith^ records a section at Martin's Bridge on Eagle 

 Creek consisting of fossiliferous shales and limestones. These 

 are but Kttle deformed. They yielded several species of Halobia 

 and a number of corals, including MontlivauUia and the cephalopod 

 Dittmarites. Condon obtained Halobia rugosa Guembel from the 



^ W. Lindgren, op. cit., p. 580. ^ T. Condon, Oregon Geology, p. 48. 



3 J. P. Smith, Am. Jour, of Sci., Series 4, XXXIII, 92-96. 



