Vol. 67.] SALOPIAN ROCKS OF CATTTLEY AND RAVENSTONEDALE. 



QO' 



is at 59° south-west by south, and cleavage has been induced in the 

 beds. C. hmdgreni and Monograptus flemingii vars. y & 3 were 

 found a few yards above the road. Yellow sandy beds yielding 

 small brachiopods and if. dubius overlie the CAundgreni Zone (C 4 ), 

 and above follow darker gritty beds containing graptolites of the 

 M.-nilssoni Zone. 



(<?) Harter Fell. 



The top of Harter Fell is occupied by Lower Ludlow rocks, and, 

 on passing down its southern and south-eastern slopes, we traverse 

 the "Wenlock, Browgill, and Llandovery Beds in turn. 



Numerous little gills, making deep gashes in the hillside, afford 

 the best exposures of the Wenlock Beds. The fossils of the lowest 

 "Wenlock are preserved in the typical solid form, and the beds 

 themselves are bine-grey banded flags. A lithological change comes 

 in with the appearance of Monograptus riccartonensis ; the rocks 

 weather with a red stain, and are gritty. The red coloration 

 becomes accentuated as the beds are traced upwards into the red 

 Ludlow grits. 



The Wenlock zones sweep round Harter Fell in a semicircle, 

 and are cut off abruptly on the east by the Sally-Beck fault. They 

 all crop out within the short distance of 230 yards. Their pre- 

 vailing angle of dip is a high one, and the direction varies 

 between north and north-north-west. The Browgill Beds are 

 exposed below the Wenlock in Five Gills ; elsewhere the strata are 

 hidden by grass and drift. 



Each individual zone differs little from those previously de- 

 scribed. Therefore only a list of places is given, where each zone 

 is exposed : — 



C.-mttrchisoni Zone (C,) Gill 2 (Five Gills). 



M.-riccartonensis Zone (C 2 ) Gills. 2, 3, 4, 5 (Five Gills). Odd 



Gill, and at the waterfall in Wan- 

 dale Beck below Adamthwaite. 



C.-rigidus Zone (C 3 ) Gills 3, 4, 5 (Five Gills). 



C.-lwidgreni Zone (C 4 ) Gills 2, 3, 4, 5 (Five Gills). Gills 



] & 2 (Three Gills). 



West of Harter Fell the Wenlock Beds are covered by drift, 

 the only exposures being those mentioned in Odd Gill and Wandale 

 Beck. They reappear, however, in Spen Gill. Here the Browgill 

 Beds pass up conformably into blue banded flags containing Mono- 

 graptus joriodon, C grtograjitus murcldsoni, and Retiolites geinitzianvs. 

 Higher in the gill the rocks have suffered much from cleavage, and 

 the only fossil fragments found were unrecognizable. 



At the waterfall calcareous concretions appear, and with them 

 Monograptus flemingii var. c and M. irfonensis. PJiacops obtusicau- 

 datus was found in a yellow sandy bed occurring between the top 

 of the CAundgreni Zone and the base of the M.-nilssoni Zone. 



