432 MR. A. WADE ON THE LLANDOVERY AND [Aug. I9II, 



e. Hard, fine, thick-bedded, calcareous conglomerate, red where weathered, 

 but greyish when freshly broken. It consists of fragments of encri- 

 nites, green earth, chocolate-coloured schist, and a few quartz pebbles 

 of sizes varying from small peas to almonds. 



/. The lowest bed visible is a purple and whitish, semi-crystalline lime- 

 stone, with white veins.' 



The shales beneath this sequence belong to the Trilobite-Dingle 

 Group. 



The beds are much faulted in the Park, and vary considerably 

 within a few yards. In some places most of them become a cal- 

 careous breccia. They are evidently a very shallow-water deposit, 

 for evidences of contemporaneous denudation can be seen in the 

 conglomerates. 



Frequently the strata are stained a deep red, on account of 

 being heavily charged with oxide of iron ; but this is not always 

 the case. When the series is traced to the south, towards Belan, 

 it is seen to consist of yellow quartzose grits, which are soft, 

 porous, and in places very fossiliferous. These beds come against 

 the Bron-y-Buckley Fault, and are either partly concealed by it or 

 are thinning out considerably. The conglomerates are seen in the 

 fields on the crest of the ridge at Belan, where they apparently 

 overlie beds yielding Monograptus flemingi and M. cf. vomerinus, 

 etc., so that the line of the fault is easily determined. 



The beds can be traced by the red nature of the soil in the 

 direction of Welshpool. Where they cross the town, they cause a 

 steep gradient in the main street. 



A conglomerate, consisting largely of limestone fragments, forms 

 the eastern wall of the Welshpool Dyke, in the quarries at the 

 southern end : this almost certainly represents the Powis-Castle 

 Conglomerate. It is altered by contact with the dyke-rock, but 

 takes on its normal appearance again at Cherry-tree Bank, farther 

 north, along the eastern flank of the Welshpool Dyke. Here the 

 strata form a ridge running north-eastwards, and are exposed 

 in two quarries — one on the Welshpool Golf-course, the other 

 in Cherry-tree Bank itself. This ridge ends abruptly in both direc- 

 tions : on the east it is terminated by the Bron-y-Buckley Fault ; 

 while on the west it terminates in the fault which lets down the 

 Welshpool Dyke. At Cherry-tree Bank the strata consist of red 

 flaggy sandstones, conglomerates, and calcareous beds, all heavily 

 charged with iron oxide, producing a red soil and staining the 

 Trilobite-Dingle Shales beneath. Fossils are difficult to find, since 

 the beds are fossiliferous on only one small horizon. This is in 

 the quarry on the golf-course, and is the uppermost bed of 

 quartzose conglomerate immediately under the turf. The beds 

 are not seen again on this side of the valley. On being traced 

 westwards, they are seen to thin out. A thin seam of conglo- 

 merate rests upon Pwll-y-glo Beds, near Ceunant Farm, in the 

 gorge west of the Welshpool Dyke : it is let down by a fault 

 which bounds that dyke again on this side. Farther west 

 the beds crop out again, forming a broad anticline between the 

 Welshpool Dyke and Cloddiau. The beds are again thicker and 

 more massive on the western side of the fold. At Cloddiau, 



