FONTAINE,] THE OROVILLE FLORA. 367 
identity by the letter i and related forms by r, getting the following 
results: 
Age of plants nearest to or identical with Oroville plants. 
Species. 
Uppermost Trias 
and Rhetic. 
by relationship. 
Potomac. 
- Thyrsopteris Maakiana Heer....................._. 
. Adiantites orovillensis Font ........................ 
. Cladophlebis spectabilis (Heer) Font ............... Boel Salis! tls 
- Cladophlebis argutula (Heer) Font ................. Seen Neen eee es 
- Cladophlebis whitbiensis tenuis var. a Heer ...._._.. diviele atersia'| Syayaral|) AE Ws 
. Cladophlebis densifolia Font ....................... Se oe ae a ee ee 
- Cladophlebis indica (Oldh. and Morr.) Font......... este bead hse: Wey |e 
. Teeniopteris orovillensis Font....................... a eee | Pee eee 
ecommin fiaevere|iareeeal) 
x : | Age not identified 
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. Pterophyllum rajmahalense Morr .................. Leteie foetal! IP lego as 
. Ctenis grandifolia Font ...................). sietegieaaiy piu seat sacl oe cei Oe 
. Ctenis auriculata Font ..............22.....--..-2-. Dig scours De 
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L. Ctenophyllum angustifolium Font ..............2... Siam (ere ere eee eee 
. Podozamites lanceolatus (L. and H.) Fr. Braun..._.. ee Serer eee | a ee 
, Podozamites lanceolatus latifolius (Brongn.) Heer ...|....|...-|.-..| i |.... 
. Baiera multifida Font.................2.22.--------- Redalll GG ace eees oSu 
. Pagiophyllum Williamsonis (Brongn.) Font......._. sose[scer eee] WP Ieee 
. Pinus Nordenskidldi Heer .....-.-......2.-.-.2.--- Seite Seve ues ea 
. Leptostrobus? sp. Font. Undetermined cone.-..-.-.. Scie Licicall eiaieie aia OX 
. Carpolithus Storrsii Font .........-.-22-2-.2-2---+--- Sere Seen ererae amen (a 
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The comparison of the Oroville plants with known floras shows 
that most of the forms for which any relationship with known plants 
can he made out find their like in the Lias and Oolite, or, without dis- 
tinguishing these, in the Jurassic. As the Oolitic forms are predomi- 
nant, we may conclude that the age of the flora is not only J urassic 
but rather late Jurassic, probably about the age of lower Oolite. If 
