Vol. 59.] FOSSIL FLORA OF THE CUMBERLAND COALFIELD. 15 



2. Nettropteris tenttifolia (Schl.). (See p. 9.) 



Woodwardian Mus. Camb., Carb. Plant Coll. No. 947. 

 Locality.— Above the Main Band, Walk Mill Pit, Moresby. 



3. JNeuropteris gigantea, Sternb. 



Woodwardian Mus. Camb., Carb. Plant Coll. Nos. 938, 948, & 952. 

 Locality.— Above the Main Band, Walk Mill Pit, Moresby. 



JSTeuropteris gigantea. 



1828. Brongniart, ' Hist, des Veget. foss.' p. 240 & pi. lxix. 



1886. Kidston, ' Catal. Palaeoz. Plants Brit. Mus.' p. 92. 



1886-88. Zeiller, ' Bassin bouill. de Valenciennes ' p. 258 & pi. xlii, fig. 1. 



1899. Potonie, ' Lehrb. d. Pflanzenpal.' p. 151, figs. 101, 105, & 150. 



1899. Zeiller, Mem. Soc. geol. France, Paleont. Mem. No. 21, vol. viii, p. 44 & 



pi. iv, fig. 10. 



1900. Zeiller, ' Elem. de Paleobot.' p. 105, fig. 79. 



1901. Kidston, Proc. Yorks. Geol. & Polytechn. Soc. n. s. vol. xiv, p. 193, pi. xxviii, 



fig. 3 & pi. xxix, fig. 4. 



Alethopteris. 



Alethopteris decurrens (Art.). 



Woodwardian Mus. Camb., Carb. Plant Coll. Nos. 902, 915, & 925. 

 Localities. — Above the Cannel Band, Robin Hood Pit, Flimby; above the Main 

 Band, Walk Mill Pit, Moresby. 



Pecopteris Mantelli. 



1828. Brongniart, ' Hist, des Veget. foss.' p. 278 & pi. lxxxiii, figs. 3-4. 



1831-37. Lindley & Hutton, ' Fossil Flora ' vol. ii, pi. cxlv. 

 Alethopteris decurrens. 



1886-88. Zeiller, 'Bassin houill. de Valenciennes' p. 221, pi. xxxiv, figs. 2-3, 

 pi. xxxv, fig. 1, & pi. xxxvi, figs. 3-4. 



1899. Potonie, ' Lehrb. d. Pflanzenpal.' p. 146, fig. 141. 



Cordaitales. 



CORDAITES. 



Cordaites principalis (Germar). (See p. 10.) 



Woodwardian Mus. Camb., Carb. Plant Coll. Nos. 906, 909, 910, & 915. 

 Localities. — Above the Cannel Band, Robin Hood Pit, Flimby ; above the Main 

 Band, Walk Mill Pit, Moresby. 



III. The Pal^obotanical Evidence as to the Age of the Beds in 

 the Whitehaven-Maryport District of the Cumberland 

 Coalfield. 



A. The Sandstone Series. 

 It is well known that the age of the lower division of the 

 Sandstone Series was for many years regarded as Permian. 

 Sedgwick, 1 who was probably the first to undertake a systematic 

 study of the Cumberland Coalfield, concluded 



' that in . . . these regions the Lower Keel Sandstone represents the rathe todte 

 liegende, or lowest division of the red sandstone series.' 



Previous to Sedgwick's conclusions, this series had been universally 

 regarded as a member of the true Coal-Measures. 2 Sedgwick's views 

 were maintained as late as 1859 by Matthias Dunn. 3 The late 



1 A. Sedgwick (32) p. 345 & (36). 3 M. Dunn (60) p. 141 



2 Id. (36; p. 395. l 



