94 Smith — The Occurrence of Coral Reefs 



many, Juvavites subinterruptus, J. subintermittens, J. Pdgari, 

 Tropites laestrigoniis, T Tetteri, Homerites semiglobosus, 

 Discotropites Theron, D. Lamxte, Pinacoceras rex, Marga- 

 rites senilis, Gonionotites, Metasibirites, Choristoctras, and 

 many other species, new and old, Tropites of the group of T. 

 Telleri, Discotropites, of the group of T. Laurae, Atractites 

 and Dictyoconites. 



A few feet above the highest Juvavites beds lies the coral 

 zone with reefs made up chiefly of Astraeidae, Isastraea pro- 

 funda, Phyllocoenia cf . dectissata, Montlivaultia cf . Mojsvari, 

 Thecosmilia cf. fenestrata, Stephanocoenia cf. juvavica, 

 Tliamnastraea cf. rectilamellosa Spongiomorpha cf. ramosa, 

 etc. 



This coral zone was found from near Pitt River, east of 

 DeLamar, northward to the North Fork, always in the same 

 horizon, between the Tropites limestones and the Pseudo- 

 monotis shales. 



A few miles south of Pitt Piver, near the junction of Cedar 

 Creek with Little Cow Creek, the Hosselkas limestone out- 

 crops again, and the coral zone is here well developed. The 

 thickness is not so great as north of Pitt Piver, being reduced 

 to not much more than one hundred feet, the Tropites beds 

 having almost disappeared. Here the writer found in the 

 coral zone banks or reefs of Thecosmilia cf. fenestrata, Isas- 

 traea prof unda Peuss, Stephanocoenia cf.juvavica, Latimcean- 

 dra cf. eucystis, and Thamnastraea cf. rectilamellosa. 



At this locality, as on Squaw Creek, the coral zone lies well 

 up in the Hosselkus limestone, and below the Pseudomonotis 

 shales. 



In the Blue Mountains of northeastern Oregon, in Baker 

 County, at Martin's bridge, near the junction of Paddy Creek 

 with Eagle River, the writer discovered in 1$08 a small coral 

 reef in the Upper Triassic limestones, of which a section is 

 given below. 



It will be noted that this section is entirely different, in the 

 lithologic sequence, from that of Shasta County, California. 

 Nothing lower than the Halobia shales was found, and the 

 writer could not determine just what part corresponded to the 

 Hosselkus limestone, since the Tropites beds were not exposed, 

 if they are present in that region. Nor could the Pseudo- 

 monotis shales be found above the coral zone, probably being 

 represented by the barren limestone. The lower shales, with 

 Halobia cf. superba, were also found at the junction of the 

 two forks of Eagle Piver, at Anthony's hydraulic mine, but 

 there the limestones that should contain the coral reef are 

 crystalline, and the fossils destroyed. Massive limestone is 

 abundant on the North Fork of Eagle Piver, but they are 

 everywhere changed to marble. 



