534 



"W. W. WATTS OX THE IGIfEOITS AND 



occur greenish- grej', barren, homogeneous or micaceous shales break- 

 ing into cuboidal fragments, alternating with more sandy beds and 

 indurated grey grits with Graptolites, which pass into thicker-bedded 

 and more obviously ashy grits weathering brown and containing 

 shells, Trilobites, and rare Graptolites. These beds are actually 

 overthrust and dip to the IS'.W. at 38° ; but I think this is simply 

 inversion, for precisely similar beds are common above the con- 

 glomerates, particularly at the south part of Bausley Hill, near a 

 farm-house, where some of the same fossils have been found. These 

 localities are the only ones from which I have obtained identifiable 

 fossils, but they seem to indicate the age of the series pretty clearly. 

 Prof. Lapworth has determined the Graptolites, and Dr. Davidson 

 the Brachiopoda. 



Climacograptus antiquus?, Lapw. 



bicornis ?, Hall. 



Scharenbergi, Lapw. 



, sp. 



Cryptograptus tricornis, Carr. 

 DicranogTaptus, sp. ? 

 Diplograptus foHaceus, Murch. 

 rugosus, Emm. 



Leptograptus flaecidus ?, Hall. 



Crinoids. 



Beyrichia complicata, Salt. 



Trinucleus concentricus, Eaton. 



fiiabriatus, Murch. 



Lingula, sp. 



Orthis testudinaria, Balm. 



Bellerophon bilobatiis, Sow. 



Orthis testudinaria, another Orthis, and crinoid stems have been 

 obtained from the second locality just named in the south part of 

 Bausley Hill * ; while Mr. Morgan t has found TTiamniscus antiquus 

 amongst other forms in ashy beds to the N".E. of Middletown Hill. 

 These fossils, of which some range from Lower to Middle Bala, 

 some from Middle to Upper Bala, and some have a wider range, 

 seem to indicate that these beds belong to the Bala group and are the 

 equivalents of the top of the Glenkiln or bottom of the Hartfell 

 series. Above them come similar unfossiliferous shales with more 

 frequent grit bands. It is certainly likely that the exact equivalent 

 of these beds may be found in the upper rocks of Hagley and Mar- 

 rington in the Corndon district, but I am not yet sufficiently familiar 

 with that area to speak with any certainty. 



"When traced to the S.W., ashy beds are intercalated between the 

 conglomerates, and a fold and fault in the rocks makes them 

 occupy a wide extent on the map. The structure of Middletown 

 Hill is explained by the subjoined diagram (fig. 1), in which the 

 fault at Middletown quarry is shown. The ash is made up of 

 fragments of decomposed felspar, often replaced by kaolin, and 

 stained light green, like some of the felspar crystals in weathered 

 pieces of Shap-Fell granite : there are also flesh-coloured and black 

 fragments, and fragments of banded volcanic rock. A large amount 

 of this rock has been quarried for china-stone, but the depth of colour 

 in all but a few beds spoiled it for this purpose. Under the micro- 

 scope the ash shows all the characters of a trachytic tuff altered to 



* Since this was written, Prof. Lapworth has found Diplograptus foliaceus 

 in this locality, and Trinucleus in the matrix of the conglomerate, 

 t Quart. Journ. Geol. Soc. xli. 111. 



