PLANT BEDS OF RATTLESNAKE AND REDDING CREEKS 383 



by Foutaiue in the Shasta beds. I regard this locality as being referable to 

 tlie Jurassic." 



Doctor Stanton examined the fossils and reports that "among the fossil 

 plants are two small shells which appear to be yomig specimens of Unio, 

 though they may belong to some marine geni;s instead." 



RELATION TO OTHER FORMATIONS 



This small mass of sediments, like that at Big Bar, rests with a marked 

 unconformity directly on the upturned edges of the older rocks. The 

 fossil flora is closely related to that of Big Bar, for two of the forms 

 found here, namely, Cijclopiti/s oregoncnsis and Tceniopteris vittata, occur 

 in the plant beds of Thompson creek and Buck creek, Oregon — type local- 

 ities for the Jurassic flora of Oregon to which that of Big Bar belongs. 

 The other form, Sequoia reichenbaclii, occurs in the Horsetown beds of 

 Eedding creek, about 20 miles northeast of Eattlesnake, and it seems pro1> 

 able that the Eattlesnake Creek mass belongs to the top of the Knoxville 

 or bottom of the Plorsetown.^ 



Plant Beds of Eedding Creek, California 



It may be well in this connection to note that near Clements house, 

 along Eedding creek, in Trinity county, Storrs collected a number of 

 plants, among which Knowlton recognized the following : 



"Saf/enopteris oregoneiisis Font. 

 Sac/enopteris elliptica ? Font. 

 Gleichcnkt ? GUhcrt thoitipsoiii Font. 

 CladophJehis hcteroplujlla Font. 

 Sequoia reicheniachi (Gein.) Heer." 



Knowlton remarks that — 



"These species, with the exception of Cladophlchis JictcrnpJn/Jhi, which Is 

 known from the lower Potomac and Kootenai, are all reported l)y Fontaine 

 from the Shasta flora of the localities along the west side of the Sacramento 

 valley, and are therefore regarded as of Lower Cretaceous age." 



The plants are commingled with marine shells which Stanton deter- 

 mined as Peden opprcnliformis, Trigonia harm, Cardium. ? Corhula, and 

 Pleuromya papyracea, and regards as lower Horsetown. At this locality 



'■On lithologic and stiatigiaphic evidence, HiM-shoy logards i( as Horsetown. .Amer- 

 ican Journal of Science, vol. xiv, 1902, p. 34. 



XXXVII — Bull. Geol. Soc. Am., Vol. 10, 1007 



