OLDER POTOMAC OF VIRGINIA AND MARYLAND. 545 



FOSSIL PLANTS FROM tiEKMAN'S IRON MINE. 



[PL LXXX, No. 53.] 



In 1897 Mr. Arthur Bibbins collected at German's iron mine a speci- 

 men of light-colored clay which on being broken through revealed a raised 

 seed on one of the pieces and the depression that it formed on the other. 

 The form of the seed is obovate, and it is probably Cycadeospermum 

 obovatuni Font. One side of the piece that contains the depression made 

 by the seed shows also a small male ament of some conifer, not very 

 distinctly preserved. The label bears the number: W. C. B., 6304. 



These specimens are not sufficient to fix the age of the bed, but 

 so far as they are concerned it may well be Arundel, as indicated on 



the label. 



FOSSIL PLANTS FROM HOBBS'S IRON MINE. 



[PI. LXXX, No. 58.] 



There are three small collections from this locality, all made by 

 Mr. Arthur Bibbins for the Maryland Geological Survey. One of them 

 has the date 1897 on the label. It consists of a single rock specimen 

 broken into three pieces. The rock is a heavy ferruginous sandstone, 

 reddish brown without and dark within. The label bears the number : 

 M. G. S., 8780. Another consists of a single rock specimen of the same 

 character. There is no date on the label, but it has the number 8317. 

 The third collection is from the dump opposite Hobbs's mine and 

 contains two specimens of a somewhat different rock having a lower 

 specific gravity. There is no date, but the number is 8872. 



Only two species, both doubtful, can be recognized among these 

 specimens. They are : 



Athrotaxopsis expansa Font. ? 4 specimens. 



Nageiopsis zamioides Font. ? 1 specimen. 



FOSSIL PLANTS FROM TIP TOP. 



[PL LXXX, No. 58.] 



Three collections were made from this locality. The first consists of 

 a single specimen obtained by Mr. Arthur Bibbins in 1890. The second 

 contains a considerable number of specimens and was made by Mr. Bibbins 

 and Professor Ward on August 31, 1896. This last is deposited in the 



HON XLVIII — 05 35 



