,ii'i;assic ki.oha of Doidi.As <<)rNiv. okfj;. 



143 



known by Iviclilhofcu from China exist in the ( )i-c<ion Hora. These will 

 he noticed before takin<i up the |)lants coininon to Oregon, Yorkshire, 

 and eastern SilxM'ia. I'Icroiilii/llinii Xdlhur.^ll and /'. coiil'unniiii hav(\ as 

 vet, been found onh' in ( )i-ei;'on and in tlu^ Kwei-tshou beds of China. 

 SeluMik tliinks tliat th(\\- can not be older than Lower .lurassic. As these 

 strata., accordinfi to Sclienk, contain I'odozainilc.^ htiircnlalus and Nih(»iin 

 compta, they are most likely Lower Oolite in aije. 



The Oregon strata have in conunon with the Kaga sti-ata of .lapan 

 Nilsonia iiiiijioticn.sis. Yokoyama I'egai-ds the Kaga strata as Lower 



Oolite. 



The Oregon strata have in common with those of Yorkshire the 

 following species, some of which are highly chai'acteristic of the Yorkshire 

 Lower Oolite: 



1. Cladojililchis dcnticulata. 



'2. Cladophl(>l)i.s liait)iinu'ii.sis. 



:i. Thvrsopteris Murrayana. 



4. Kufi'ordia Gopperti. 



.5. TiPiiiopteris major. 



6. Tffiiiioptcris vittata. 



7. Sagenoptori.s paucifolia. 



S. Ptilozaiiiitcs Li'ck(Mil)yi. 



!l. Xiisoiiia compta. 



10. Podozamitcs lanccolatus. 



11. Ctenis sulcicaulis. 



12. Ginkgo digitata. 

 ]'■]. Taxites zamioide.s. 



14. Bracliyiihylliim mamillare. 



Fourteen out of the 37 well-characterized species not new. 

 In common with the Siberian Jurassic there are the following: 



1. 



2. 

 3. 

 4. 

 5. 

 6. 

 7. 

 8. 



Cladoplilebis acutiloba. 

 Tliyrsopteris Murrayana. 

 Nilsonia orientalis. 

 Nilsonia parvula. 

 Ptcrophyllum rajmahalense. 

 Podozamites pulchellus. 

 Podozamites lanceolatus. 

 Podozamites lanceolatus minor. 



y. Podozamites lanceolatus latil'olius. 



10. Ginkgo digitata. 



1 1 . Ginkgo Huttoni. 



12. Ginkgo lepida. 

 1.3. Ginkgo sihirica. 



14. Seeds of Ginkgo. 



15. Pinus Nordenskicildi. 



16. Bracliyphyllum mamillare. 



Sixteen out of the 37 determined species not new. 



The Oregon strata rival those of eastern Siberia in the development 

 of Ginkgos, and it is a noteworthy fact that nearly all the more impor- 

 tant species made by Heer from those beds have similar forms in the 

 Oregon strata. This similar great expansion of Ginkgos is strong proof 



