OLDER POTOMAC OF VIRGINIA AND MARYLAND. 571 



FOSSIL PLAKTSFEOM SPUINGFIELD. 



[PI. LXXX, No. 26.] 



The plants now in question are designated on the labels accompany- 

 ing them as coming from Springfield, and the formation yielding them 

 is given as Patuxent. The rock material yielding the fossils is a reddish 

 brown sandstone, which is highly ferruginous, with a cement of limonite. 

 Although there is a considerable amount of this material, not many of 

 the plant impressions can be determined, owing to the fact that it is 

 not favorable for their preservation. The fragments of plants are much 

 macerated and seem to have floated long in water. Most of the plant 

 matter is in the form of decayed bits of stems that can not be determined. 

 These specimens were collected by Mr. Bibbins in August, 1894, for 

 the museum of the Woman's College of Baltimore, whose numbers are 

 on the labels. 



The following plants have been found at this locality: 



Athrotaxopsis expansa Font. ? 3 specimens. 



Athrotaxopsis tenuicaulis Font 1 specimen. 



Equisetum Lyellii Mant. ? 2 specimens. 



Sequoia subiilataHeer? ^ 2 specimens. 



Thyrsopteris nervosa Font. ? 1 specimen. 



This hst, as will be seen, is a very small one, and only one specimen, 

 Athrotaxopsis tenuicaulis, is capable of positive determination. 



These plants are not sufficient to determine the age of the strata 

 containing them, but so far as their evidence goes, it indicates that it 

 is that of the lowest portion of the Lower Potomac, the Rappahannock, 

 and the James River series of Professor Ward. 



FOSSIL PLANTS FROM STEMMERS BUN. 



[PI. LXXX, No. 41.] 



Hengmehl's iron mine, Stemmers Run, furnishes one specimen 

 which can not be determined." 



in some small pocket of Pleistocene (Columbia) clay, such as that which is sometimes found in excavating 

 cellars, etc., in Washington, and which usually contains the remains of so-called cedar wood in a perfect state 

 of preservation. Such a case occurred at the "Casino" on Connecticut avenue, and similar deposits have 

 been found in the eastern part of the city, the Potomac clays immediately underlying the Columbia beds.— 



L. F. W. 



alt is from this general region that the cycad, Cycadeoidea Fisherse, described above (p. 470), was 



obtained.— L. F. W. • 



