WHITE] FLORA OF THE UPPER INTERMEDIATE DIVISION. 801 



although htiving little in coinmon with the plant associations of the 

 Lower Lykens division. The small plant collections from the phy- 

 tiferous terranes in the remaining upper portion of the lithologic t3'pe 

 section, which collectively were designated on an earlier page (7T5) 

 the '"'■ Upper Intermediate division," will be found to contain a still 

 larger proportion of Coal Measures species, though yet exhibiting 

 manv forms which are common in the beds of supposed Pottsville age 

 in other regions, and which are still unknown in the Lower Coal Meas- 

 ures. The two beds in question are but 35 feet apart, or 2-i5 and 210 

 feet, respectivelv, below the Twin coal. They are both, as may be 

 seen by reference to the section, Pl.CLXXXI, intercalated in the mas- 

 sive conglomerates which succeed the great white, egg conglomerate that 

 underlies the south portion of the railroad bridge at the north end of the 

 gap. The conglomerate last mentioned is, on account of its hardness, 

 light color, thickness, and the regularity of its coarse quartz pebbles, 

 one of the most easily recognized beds, lithologically, of the Pottsville 

 formation over a large portion of the Southern Anthracite field. By 

 glancing at the columns of the table showing the species furnished in 

 the small collections, obtained with some difficulty from the coal}-^ or 

 shaW partings between the conglomerates, we find that Alethojjteris 

 Se)'Ui, A. coxto7iiana^ Neuropteris ovata^ iV\ Desoriif^ tiplienophyUum 

 cuneifolium, and Slgillaria cf. Icevigata have been obtained from l^ed 

 M, while Pseudoj)ecopte7'i8 cf. squamosa^ Pecopteris sp., Neuropteris 

 ovata^ Aletliopteris Serli'i^ Cardiocarpon elongatum var. intermediwn^ 

 C. annxdatum^ and, perhaps, C. hicuspidatwn var. ohioense are 

 present in bed N. The last identification is uncertain, since the speci- 

 mens, which were obtained from coarse, conglomeratic sandstones, are 

 very indistinct and fragmentary. The Pecopteris species comprises a 

 villous type close to the ferns described by Professor Lesquereux as 

 Pecopteris vestita from the Lower Coal Measures of ^Missouri, and as 

 P. Buchlandii Brongn., from the Pottsville formation at Campbell 

 Ledge, near Pittston, Pennsylvania. 



With, perhaps, the exception of the Alethopteris coxtoniana^ the 

 fiora of l)ed N is apparently as ancient as that of M. The com- 

 bined list from these two beds, which, on account of their stratigraphic 

 proximity and their similar plant contents, ma}" for the present be 

 treated as one flora, contains l)ut 11 species, yet these are of a highly 

 interesting and suggestive character. But one fern species,^ Alethop- 

 teris coxtoniana., is represented in the collections from the Lykens 

 groups. The remaining ferns are either identical with the species 

 of the Lower Coal Measures of the same region, though varying 

 somewhat in minor details, such as size, or are very closely bound to 

 typical Coal Measures species. Sphe7iopkyllu7n cuneifolium is repre- 



1 yeuropteris ovala is represented by a variety in the roof of one of the upper Lykens coals at New 

 Lincoln. 



20 OEOL, PT 2 51 



