30 



FOSSIL ESTHERLE. 



Yds. 



"Rough Rock" of the Lancashire geo- 

 logists, "Upper Millstone-grit" of 



the Geological Surveyors 6 



Sand-delph Coal, or Feather-edge Coal. 



Rough rock 20 



Lower flags and shales 1 20 



Coal 



Shale 2 



Coal 



Black shale 8 



Black shale and sandstone 6 



Coal 



Shale 4 



"Upper Millstone-grit " of the Lanca- 

 shire geologists 60 



Dark shale 40 



Coal 



Dark shale 15 



Coal 



Dark shale 6 



"Lower Millstone-grit," with its part- 

 ings 130 



Limestone-shale, containing beds of 



grit-stone 300 



ft. in. 











1 



6 



e 



















6 















8 



















1 



3 































4 















8 



















The roof is generally a grit-stone ; but at Birtle 

 Dean, near Bury, it is a shale with Aviculo- 

 pecten, &c. 



Aviculo-pecten, Goniatites, &c. 



[E. W. Binney, Feb. 7, I860.] 



Habitat of E. striata. — With regard to the possibly freshwater or marine character of 

 the Est her i a striata, above treated of, as indicated by its associates, I can only say that, 

 excepting the occasional proximity of those dubiously marine forms, the Anthracosia and 

 Anthracomyce, and the presence of Spirorbis at Lammerton, sea-shells are wanting in the 

 shales and cannel-coal in which this Estheria has been found. 



In the ' Letheea Rossica,' livr. vi, 1859, p. 90, Mr. Eichvvald describes under the name 

 of " Posidoiiowya ini/nita, Goklfuss," what may prove to be an Esthcrian fossil from shale 

 apparently belonging to the Carboniferous Formation, near Izoume, in the government of 

 Kharkof." It measures 1 — If line in one diameter, and 1 line in the other. The valves are 

 described as being horny, deep-brown, oblique, very thin, and very small ; rather broader 

 than long, rounded on the inferior border, nearly straight on the superior, and without an 

 anterior ear; surface wrinkled with concentric (8 — 10) ridges, somewhat deep, unequal, 

 concentric to the umbos, which are scarcely distinguished. 



