ON THE STOCKDALE SHALES. 



685 



streamlets unite at the 900-feet contour-line to form a tributary of 

 Hallgill, and the southernmost of these displays the Stockdale Shales 

 dipping to the S.S.E., and striking transversely across the beck. 



The lowest bed seen belongs to the zone of Ampyx aloniensis, 

 and one of the calcareous nodular bands is seen in it, and above it 

 is the base of the s^nnigerus-zone, composed of black earthy shales 

 crowded with Monograptus discretas, Nich., and containing also 

 M.jaculmn, Lapw., and other fossils. Above this is a short interval, 

 and then the upper part of the spinigerus-zonQ comes on, exhibiting 

 the usual variegated shales, with : — 



Monograptus spinigerus, Nick. 



jacukim, Lapw. 



distans, Tortl. 



crassus, Lapw. 



Rastrites urceolus, Bichter. 

 Diplograptus tamariscus, Nich. 



Diplograptus modestus, Lapw. ? 

 Petalograptus palmeus, Bari\ 

 Cliinacograptu8 normaHs, Lapw. 

 Retiolites perlatus, Nich. 

 Peltocaris. 



These shales are succeeded by 10 feet of blue mudstone, belonging 

 to the A.-erimweus zone, in which no fossils have been found here. 



These pass into the Browgill Beds, some feet of which are seen in 

 the stream, after which is a gap in the place where the turrioula- 

 tus-hesiviug black band should occur. No signs of it are visible. 

 Above this are more pale-green shales, with a few black bands con- 

 taining badly i)reserved Graptolites. Some of the bands are pro- 

 bably covered up, for in the stream immediately below this are 

 loose fragments containing the Graptolites characteristic of the 

 M.-crispus zone, including : — 



Monograptus crispus, Lapw. 



exiguus, Nich. 



discus, Tornq. 



pandus, Lapw. 



Monograptus jacuhmi, Lapw. 

 Petalograptus pahneus, Barr. 

 Retiolites Greinitzianus, Barr. 



TrouthecJc Valley. 



A marked depression indicates the position of the Skelgill Beds 

 above the section just described, and an isolated exposure on the 

 moorland jast south of the summit of the Garbourn Pass furnishes 

 the following fossils of the Jlmbriatus-zone : — 



Monograptus fimbriatus, Nich. 

 Diplograptus tamariscus, Nich. 

 sinuatus, Nich. 



Climacograptus normalis, Lapw. 

 Orthoceras araneosum, Barr. 



Proceeding to the Troutbeck side of the pass, the depression 

 marked by the mudstones or, rather, more probably by a fault 

 which cuts them out entirely, is seen running diagonally down the 

 hillside towards Troutbeck church, shifted laterally by some small 

 dip-faults, a,nd crossing the Garbourn road just below the large 

 flag-quarries. On the hillside above this depression are several 

 exposures of and quarries in the Browgill Beds, but no continuous 

 section. On reaching the bottom of the valley the beds are shifted 



Q.J.G.S. No. 176. 2z 



