14 



TRANSACTIONS OF THE 



ous rock, coarsely laminated, and separated by thin 

 partings of shale. Some of the slates are of fine texture, 

 and contain chlorite, magnesia, mica and ferruginous 

 matter. Animal remains have not been detected in 

 them. 



The marine vegetable fossils are all referrible to the 

 family fucoides. Fucoides Jllleghaniensis has been 

 originally described by Dr. Harlan from this locality, 

 and is the most remarkable fossil here. In one variety 

 the rugae of the branches or digits are more strongly 

 serrated than those figured by Dr. Harlan. 



F. Brongniartii) also described by the same natu- 

 ralist, occurs here, but more sparingly. Vid. pi. iii, 

 fig. 6. 



Figures 1, 2, pi. L and iii, pi. ii. and v, pi. ii. are 

 sketches one-fourth the natural scale, of another spe- 

 cies of fucoides, distinguished by its long, flexible and 

 flattened stalks, with few branches. The breadth of 

 these stalks is commonly half an inch, but sometimes 

 greater. The specimens are sketched from slabs which 

 occur in the Long Narrows. It would have better 

 served the purpose of scientific illustration, could more 

 perfect specimens, exhibiting the superior terminations 

 of these plants, have been procured. 



Figure 4, pi. ii. is a sketch from a large slab of that 

 species which has been referred to as obscure or inde- 

 terminate, and which covers in relief the upper sur- 

 faces of the pavement slabs used in the streets of Lew- 

 is town. It occurs in greater profusion than the other 

 species. Hundreds of beds ? some of them not an inch 



