220 MISS G. E, WATNEY AND MISS E. G. WELCH ON THE [May I 9 1 1 , 



Cyrtograptus-lundgreni Zone (C 4 ). — The lower part of 

 Middle Gill is largely covered by drift, and the few exposures are 

 poor. They yield M.jiemingii var. B and M. dubius, and dip at 

 41° north-north-westwards. 



A large quarry between Middle and Near Gills on the Sejdbergh 

 road yields the associates 0. lundgreni, M.jiemingii var. d, and 

 M. dubius. The rock is a very massive blue flag, 



(iii) Near Gill. 



In Near Gill the exposures are smaller than in either of the 

 gills already described, but the fossils are in a better state of 

 preservation, and all four zones are well seen. 



Cyrtograptus-murcliisoni Zone (CJ. — Some 30 yards 

 below the old road, a small exposure on the left bank of the gill 

 yields G. murckisoni and the forms associated with that fossil. 

 The beds are much affected by the ' old road dyke,' and have been 

 converted into pale, flinty, unbedded rock. 



Monograptus-riccartonensis Zone (C„). — For the next 

 100 yards the only exposures are very small ones in the gill-bed. 

 It is difficult to identify the fossils, but, from their crowded occur- 

 rence and general form, they can be recognized as M. riccartonensis. 



Oyrtograptus-rigidus Zone (C 3 ). — At the bend of the 

 stream ochre-stained beds form a small cliff on the right bank, and 

 a scree-slope on the left baDk ; their dip is 32° north-westwards. 



A richly fossiliferous band occurs in the cliff, containing many 

 examples of C. rigidus and Monograptus fleosilis ; on the opposite 

 bank C. linnarssoni, C. rigidus, and M. Jlexilis occur abundantly. 

 Hetiolites spinosus is also common — this fossil has hitherto been 

 recorded in Britain from the Lower Ludlow rocks only. About 

 25 yards lower down, an exposure in the left bank yields C. rigidus 

 and Monograptus Jlemingii var. a. 



The higher part of this zone occupies two scree-slopes 100 yards 

 down stream ; here the rocks are characteristically pyritous, and 

 contain M. Jlemingii var. a in abundance. 



A small lamprophyre-dyke occurs in the left bank of the gill just 

 Below the screes : its trend is north-west by west. 



Cv rtog r aptus-lundg r eni Zone (C 4 ). — Below the dyke pj-rite 

 is no longer seen in the rock, which assumes the normal cleaved 

 appearance. The most common species is M.jiemingii var y, here, 

 as usual, characteristic of the lower part of the zone. Some yards 

 farther down C. lundgreni occurs in the left bank. Down stream 

 the rocks become less massive, and show a greater tendency to 

 break along the bedding-planes. 



The beds throughout the zone dip at 26° north-westwards. Near 

 the Sedbergh road they become lighter in colour and more sandy. 



