Maryland Geological Survey 121 



Sequoia ambigua Heer 



Sequoia fastigiata Heer ? 



Sequoia Reichenhachi (Gein.) Heer 



Sequoia rigida Heer 



Sequoia Smittiana Heer 



Sphenolepis Sternbergiana (Dunk.) Schenk 



Sphenolepis Kurriana (Dunk.) Schenk 



Sphenolepis sp., Dawson 



Sphenopteris sp., Dawson 



Taonurus incertus Dawson 



Taxodium cuneatum Newberry 



Widdringtonites ramosus (Font.) Berry ? 



Williamsonia ? sp., Dawson 



Zamites acutipennis Heer 



Zamites apertus Newberry 



Zamites arcticus Goeppert 



Zamites borealis Heer 



Zamites ^nontana Dawson 



The Kootanie flora comprises 1 lycopod, 3 equiseteae, 34 species of ferns, 

 19 cycads, and 25 conifers. One monocotyledon, a Gyperites, is reported 

 by Dawson, but it is of absolutely no significance, and a number of the 

 other species in this flora listed on the authority of Dawson are of very 

 questionable value. The Kootanie and Potomac floras have about a 

 score of species in common, as well as others not positively identified, 

 and a number of closely allied forms. 



Wyoming 

 The cycad trunks from the Freezeout Hills of Carbon County, Wyo- 

 ming, come from the Atlantosaurus beds of Marsh (Morrison forma- 

 tion). Opinion is divided as to whether they are of late Jurassic or 

 early Cretaceous age, the weight of the evidence leaning toward the 

 latter assumption. The species, all of which have been described by 

 Ward,^ are : 



Cycadella Beecheriana Ward 

 Cycadella carbonensis Ward 

 Cycadella cirrata Ward 



^ Ward, Description of a New Genus and Twenty New Species of Fossil 

 Cycadean Trunks from the Jurassic of Wyoming, Proc. Wash. Acad. Sci., vol. 

 i, 1900, pp. 253-300. Ward, Jurassic Cycads from Wyoming, Mon. U. S. Geol. 

 Surv., vol. xlviii, 1906, pp. 179-203, pis. xlvi-lxiii. 



