OLDER POTOMAC OF VIH(iIMA AND MARYLAND. 519 



KOSSII. I'1,\MS IKon IKllICi ((ITTA. 



[PI. LXXX, No. 120.] 



At Terra Cotta station, on tlie Meti'opolilaii Biancli of tho Baltimore 

 and ( )liio l!ailrf)a(l, near Washington, al)ov(> the hi'id^e ovei- the raih-oad, 

 in disturbed chiy over th(> basal Potomac sand, I collected on July 23, 

 LS9;i an obscure plant impression that looks like the ihizome of some 

 iMjuisetuni. It is pi'obably E. rityiniciini \'\m\. 



KOSMI. I'l.AMS HCIIll IVV (in. 



[PI. IvXXX, No. i:^o.J 



On July 21, LS96, Mr. Arthur Bibbins made a small collection of 

 fossil plants from this locality, and two da}'s later he and Professor 

 Ward obtained a few additional specimens from the same place. Both 

 collections are deposited in the National Museum. The locality is a 

 sandpit neai' nn ii-on mine, adjacent to the iioi'thwest corner of tlie Ivy 

 City race course. The plants occiu' in ferruginous crusts at the base 

 of the pit. They are found in a coarse sand cemented by iron oxide 

 into a sandstone, hence the preservation is very imperfect, on account 

 l)oth of the comminuted condition of the plants and of the action of 

 the iron on them. The following species were found there: 



Cladophlebis sphenopteruides Font. ? 1 specimen. 



Pecopteris constricta Font 1 specimen. 



Sphenolepidium Kiirrianinn (Dunk.) Heer? 1 specimen. 



Thyisopteri.s Meekiana Font. :! 1 specimen. 



Thyrsopteris nervosa Font 5 specimens. 



Thyrsopteris rarinervis Font. ? 5 specimens. 



Most of these fossils are too imperfect to permit a positive identifi- 

 cation. They are in the form of small bits that are generally macerated 

 by water action. This collection is not sufficient to prove the age of 

 the strata, but it strongly indicates that they belong to the horizon of 

 the Pappahannock or Fredericksburg beds. 



KOSSIl, l'l,A>TS KKOM l,AN<il>l).>. 



[PI. LXXX, No. i:u.] 



This locality was discovered by Mr. Arthur Bibbins, who, on June 

 10, 1896, made a considerable collection from it for the State Geological 

 8mvev of Maryland. 



